CVE-2026-3833 (GCVE-0-2026-3833)
Vulnerability from cvelistv5
Published
2026-04-30 17:37
Modified
2026-08-26 22:05
CWE
  • CWE-178 - Improper Handling of Case Sensitivity
Summary
A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.
References
https://access.redhat.com/errata/RHSA-2026:13274 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20611 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20612 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20613 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26319 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26409 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29197 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30004 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30849 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30850 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:32962 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33125 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41921 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:43575 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57402 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:58981 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-3833 vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2445763 issue-tracking, x_refsource_REDHAT
https://gitlab.com/gnutls/gnutls/-/issues/1803
Impacted products
Vendor Product Version
Version: 0   
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   Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.8.10-4.el10_2   < *
    cpe:/o:redhat:enterprise_linux:10.2
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   Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:3.8.9-9.el10_0.19   < *
    cpe:/o:redhat:enterprise_linux_eus:10.0
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   Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:3.3.29-9.el7_9.2   < *
    cpe:/o:redhat:rhel_els:7
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   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:3.6.16-8.el8_10.6   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
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   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:3.6.16-8.el8_10.6   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
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   Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 0:3.6.14-10.el8_4.1   < *
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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   Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 0:4.13-3.el8_4.1   < *
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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   Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 0:3.6.14-10.el8_4.1   < *
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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   Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 0:4.13-3.el8_4.1   < *
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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   Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:3.6.16-5.el8_6.5   < *
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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   Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:4.13-3.el8_6.2   < *
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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   Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:3.6.16-5.el8_6.5   < *
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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   Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:4.13-3.el8_6.2   < *
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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   Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:3.6.16-7.el8_8.4   < *
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
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   Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:4.13-4.el8_8.1   < *
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
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   Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:3.6.16-7.el8_8.4   < *
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
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   Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:4.13-4.el8_8.1   < *
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
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   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:3.8.10-4.el9_8   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
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   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:3.8.10-4.el9_8   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
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   Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:3.7.6-21.el9_2.7   < *
    cpe:/a:redhat:rhel_e4s:9.2::appstream
    cpe:/o:redhat:rhel_e4s:9.2::baseos
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   Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:3.8.3-4.el9_4.6   < *
    cpe:/a:redhat:rhel_e4s:9.4::appstream
    cpe:/o:redhat:rhel_e4s:9.4::baseos
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   Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:3.8.3-6.el9_6.4   < *
    cpe:/a:redhat:rhel_eus:9.6::appstream
    cpe:/o:redhat:rhel_eus:9.6::baseos
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   Red Hat Red Hat OpenShift Container Platform 4.19 Unaffected: 4.19.9.6.202608182320-0   < *
    cpe:/a:redhat:openshift:4.19::el9
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   Red Hat Red Hat Discovery 2 Unaffected: 1782159791   < *
    cpe:/a:redhat:discovery:2::el9
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   Red Hat Red Hat Discovery 2 Unaffected: 1782166952   < *
    cpe:/a:redhat:discovery:2::el9
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   Red Hat Red Hat Hardened Images Unaffected: 3.8.13-1.hum1   < *
    cpe:/a:redhat:hummingbird:1
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   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525684   < *
    cpe:/a:redhat:rhui:5::el9
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   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525671   < *
    cpe:/a:redhat:rhui:5::el9
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   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525693   < *
    cpe:/a:redhat:rhui:5::el9
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   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525739   < *
    cpe:/a:redhat:rhui:5::el9
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   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1787241211   < *
    cpe:/a:redhat:rhui:5::el9
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   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1787135742   < *
    cpe:/a:redhat:rhui:5::el9
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   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1787241260   < *
    cpe:/a:redhat:rhui:5::el9
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   Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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   Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Show details on NVD website


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                "timestamp": "2026-04-30T18:37:27.251775Z",
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          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
          "vendor": "Red Hat",
          "versions": [
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              "status": "unaffected",
              "version": "0:3.3.29-9.el7_9.2",
              "versionType": "rpm"
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:enterprise_linux:8::appstream",
            "cpe:/o:redhat:enterprise_linux:8::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat",
          "versions": [
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              "versionType": "rpm"
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        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:enterprise_linux:8::appstream",
            "cpe:/o:redhat:enterprise_linux:8::baseos"
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          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8",
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              "versionType": "rpm"
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.4::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
            "cpe:/o:redhat:rhel_aus:8.4::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:3.6.14-10.el8_4.1",
              "versionType": "rpm"
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.4::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
            "cpe:/o:redhat:rhel_aus:8.4::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "libtasn1",
          "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
          "vendor": "Red Hat",
          "versions": [
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              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.13-3.el8_4.1",
              "versionType": "rpm"
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.4::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
            "cpe:/o:redhat:rhel_aus:8.4::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:3.6.14-10.el8_4.1",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.4::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
            "cpe:/o:redhat:rhel_aus:8.4::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "libtasn1",
          "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
          "vendor": "Red Hat",
          "versions": [
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              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.13-3.el8_4.1",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.6::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
            "cpe:/o:redhat:rhel_aus:8.6::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:3.6.16-5.el8_6.5",
              "versionType": "rpm"
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.6::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
            "cpe:/o:redhat:rhel_aus:8.6::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "libtasn1",
          "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.13-3.el8_6.2",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.6::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
            "cpe:/o:redhat:rhel_aus:8.6::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:3.6.16-5.el8_6.5",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.6::appstream",
            "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
            "cpe:/o:redhat:rhel_aus:8.6::baseos",
            "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "libtasn1",
          "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.13-3.el8_6.2",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:rhel_e4s:8.8::appstream",
            "cpe:/a:redhat:rhel_tus:8.8::appstream",
            "cpe:/o:redhat:rhel_e4s:8.8::baseos",
            "cpe:/o:redhat:rhel_tus:8.8::baseos"
          ],
          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:3.6.16-7.el8_8.4",
              "versionType": "rpm"
            }
          ]
        },
        {
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[\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2445763\", \"name\": \"RHBZ#2445763\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://gitlab.com/gnutls/gnutls/-/issues/1803\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-178\", \"description\": \"Improper Handling of Case Sensitivity\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-08-26T22:05:04.410Z\"}, \"x_redhatCweChain\": \"CWE-178: Improper Handling of Case Sensitivity\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-3833\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-26T22:05:04.410Z\", \"dateReserved\": \"2026-03-09T14:00:51.698Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-04-30T17:37:05.818Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
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  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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