cvelistv5 - cve-2026-42765

CVE-2026-42765 (GCVE-0-2026-42765)

Vulnerability from cvelistv5

Published

2026-06-09 16:03

Modified

2026-06-10 07:48

Severity ?

CWE

CWE-476 - NULL Pointer Dereference

Summary

Issue summary: When a partial-chain certificate verification is enabled together with OCSP response checking for the whole chain, a NULL dereference will happen if the verified chain does not have a self-signed trusted anchor, crashing the process. Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application. When performing OCSP response checking for certificates in the verification chain, the code always tries to access the next certificate as the issuer. There is a check for a self-signed certificate. However with the partial chain verification enabled when the chain does not have a self-signed trusted anchor, the issuer will be NULL for the last certificate in the chain. A NULL pointer dereference then happens. This issue affects only applications which enable both OCSP verification of the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial chain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate verification. Both flags are disabled by default. For that reason, we have assigned Low severity to the issue. No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.

References

URL

Tags

	https://openssl-library.org/news/secadv/20260609.txt	vendor-advisory
	https://github.com/openssl/openssl/commit/14340b7fa1d444615486bc137014b064e64ec334	patch
	https://github.com/openssl/openssl/commit/eb345da18ce2216b2f3ade9c2bc23e068487fa97	patch

Impacted products

	Vendor	Product	Version
	OpenSSL	OpenSSL	Version: 4.0.0 ≤ Version: 3.6.0 ≤

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
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                "id": "CVE-2026-42765",
                "options": [
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                    "Exploitation": "none"
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                  },
                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-09T19:35:48.849695Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
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        "providerMetadata": {
          "dateUpdated": "2026-06-09T19:36:06.889Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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        }
      ],
      "metrics": [
        {
          "format": "other",
          "other": {
            "content": {
              "text": "Low"
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          "name": "OpenSSL Advisory",
          "tags": [
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          "url": "https://openssl-library.org/news/secadv/20260609.txt"
        },
        {
          "name": "4.0.1 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/14340b7fa1d444615486bc137014b064e64ec334"
        },
        {
          "name": "3.6.3 git commit",
          "tags": [
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          "url": "https://github.com/openssl/openssl/commit/eb345da18ce2216b2f3ade9c2bc23e068487fa97"
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      "source": {
        "discovery": "UNKNOWN"
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  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
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    "datePublished": "2026-06-09T16:03:25.934Z",
    "dateReserved": "2026-04-29T09:22:27.968Z",
    "dateUpdated": "2026-06-10T07:48:00.427Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42765\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-09T19:35:48.849695Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-09T19:36:01.956Z\"}}], \"cna\": {\"title\": \"NULL Dereference in Certificate Verification with OCSP Checking\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Joshua Rogers (Aisle Research)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Joshua Rogers (Aisle Research)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Daniel Kubec\"}], \"metrics\": [{\"other\": {\"type\": \"https://openssl-library.org/policies/general/security-policy/\", \"content\": {\"text\": \"Low\"}}, \"format\": \"other\"}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.0.0\", \"lessThan\": \"4.0.1\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.6.0\", \"lessThan\": \"3.6.3\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-06-09T14:00:00.000Z\", \"references\": [{\"url\": \"https://openssl-library.org/news/secadv/20260609.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/14340b7fa1d444615486bc137014b064e64ec334\", \"name\": \"4.0.1 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/eb345da18ce2216b2f3ade9c2bc23e068487fa97\", \"name\": \"3.6.3 git commit\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue summary: When a partial-chain certificate verification is enabled\\ntogether with OCSP response checking for the whole chain, a NULL dereference\\nwill happen if the verified chain does not have a self-signed trusted anchor,\\ncrashing the process.\\n\\nImpact summary: A NULL pointer dereference can trigger a crash which leads to a\\nDenial of Service for an application.\\n\\nWhen performing OCSP response checking for certificates in the verification\\nchain, the code always tries to access the next certificate as the issuer.\\nThere is a check for a self-signed certificate. However with the partial\\nchain verification enabled when the chain does not have a self-signed trusted\\nanchor, the issuer will be NULL for the last certificate in the chain. A NULL\\npointer dereference then happens.\\n\\nThis issue affects only applications which enable both OCSP verification\\nof the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial\\nchain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate\\nverification. Both flags are disabled by default. For that reason, we have\\nassigned Low severity to the issue.\\n\\nNo FIPS modules are affected by this issue as the affected code is outside\\nthe OpenSSL FIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: When a partial-chain certificate verification is enabled\u003cbr\u003etogether with OCSP response checking for the whole chain, a NULL dereference\u003cbr\u003ewill happen if the verified chain does not have a self-signed trusted anchor,\u003cbr\u003ecrashing the process.\u003cbr\u003e\u003cbr\u003eImpact summary: A NULL pointer dereference can trigger a crash which leads to a\u003cbr\u003eDenial of Service for an application.\u003cbr\u003e\u003cbr\u003eWhen performing OCSP response checking for certificates in the verification\u003cbr\u003echain, the code always tries to access the next certificate as the issuer.\u003cbr\u003eThere is a check for a self-signed certificate. However with the partial\u003cbr\u003echain verification enabled when the chain does not have a self-signed trusted\u003cbr\u003eanchor, the issuer will be NULL for the last certificate in the chain. A NULL\u003cbr\u003epointer dereference then happens.\u003cbr\u003e\u003cbr\u003eThis issue affects only applications which enable both OCSP verification\u003cbr\u003eof the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial\u003cbr\u003echain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate\u003cbr\u003everification. Both flags are disabled by default. For that reason, we have\u003cbr\u003eassigned Low severity to the issue.\u003cbr\u003e\u003cbr\u003eNo FIPS modules are affected by this issue as the affected code is outside\u003cbr\u003ethe OpenSSL FIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-06-10T07:48:00.427Z\"}}}",
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    }
  }
}

CERTFR-2026-AVI-0717

Vulnerability from certfr_avis

De multiples vulnérabilités ont été découvertes dans OpenSSL. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à la confidentialité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
OpenSSL	OpenSSL	OpenSSL versions 1.0.x antérieures à 1.0.2zq
OpenSSL	OpenSSL	OpenSSL versions 4.x antérieures à 4.0.1
OpenSSL	OpenSSL	OpenSSL versions 3.5.x antérieures à 3.5.7
OpenSSL	OpenSSL	OpenSSL versions 1.1.x antérieures à 1.1.1zh
OpenSSL	OpenSSL	OpenSSL versions 3.x antérieures à 3.0.21
OpenSSL	OpenSSL	OpenSSL versions 3.6.x antérieures à 3.6.3
OpenSSL	OpenSSL	OpenSSL versions 3.4.x antérieures à 3.4.6

References

Title

Publication Time

Tags

Bulletin de sécurité OpenSSL

2026-06-09

vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "OpenSSL versions 1.0.x ant\u00e9rieures \u00e0 1.0.2zq",
      "product": {
        "name": "OpenSSL",
        "vendor": {
          "name": "OpenSSL",
          "scada": false
        }
      }
    },
    {
      "description": "OpenSSL versions 4.x ant\u00e9rieures \u00e0 4.0.1",
      "product": {
        "name": "OpenSSL",
        "vendor": {
          "name": "OpenSSL",
          "scada": false
        }
      }
    },
    {
      "description": "OpenSSL versions 3.5.x ant\u00e9rieures \u00e0 3.5.7",
      "product": {
        "name": "OpenSSL",
        "vendor": {
          "name": "OpenSSL",
          "scada": false
        }
      }
    },
    {
      "description": "OpenSSL versions 1.1.x ant\u00e9rieures \u00e0 1.1.1zh",
      "product": {
        "name": "OpenSSL",
        "vendor": {
          "name": "OpenSSL",
          "scada": false
        }
      }
    },
    {
      "description": "OpenSSL versions 3.x ant\u00e9rieures \u00e0 3.0.21",
      "product": {
        "name": "OpenSSL",
        "vendor": {
          "name": "OpenSSL",
          "scada": false
        }
      }
    },
    {
      "description": "OpenSSL versions 3.6.x ant\u00e9rieures \u00e0 3.6.3",
      "product": {
        "name": "OpenSSL",
        "vendor": {
          "name": "OpenSSL",
          "scada": false
        }
      }
    },
    {
      "description": "OpenSSL versions 3.4.x ant\u00e9rieures \u00e0 3.4.6",
      "product": {
        "name": "OpenSSL",
        "vendor": {
          "name": "OpenSSL",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-34180",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34180"
    },
    {
      "name": "CVE-2026-35188",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-35188"
    },
    {
      "name": "CVE-2026-42766",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42766"
    },
    {
      "name": "CVE-2026-9076",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-9076"
    },
    {
      "name": "CVE-2026-34181",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34181"
    },
    {
      "name": "CVE-2026-42770",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42770"
    },
    {
      "name": "CVE-2026-45445",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45445"
    },
    {
      "name": "CVE-2026-7383",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-7383"
    },
    {
      "name": "CVE-2026-42771",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42771"
    },
    {
      "name": "CVE-2026-42765",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42765"
    },
    {
      "name": "CVE-2026-42769",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42769"
    },
    {
      "name": "CVE-2026-45447",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45447"
    },
    {
      "name": "CVE-2026-45446",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45446"
    },
    {
      "name": "CVE-2026-34183",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34183"
    },
    {
      "name": "CVE-2026-42767",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42767"
    },
    {
      "name": "CVE-2026-42764",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42764"
    },
    {
      "name": "CVE-2026-42768",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42768"
    },
    {
      "name": "CVE-2026-34182",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34182"
    }
  ],
  "initial_release_date": "2026-06-10T00:00:00",
  "last_revision_date": "2026-06-10T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0717",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-06-10T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "D\u00e9ni de service \u00e0 distance"
    },
    {
      "description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
    },
    {
      "description": "Atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es"
    },
    {
      "description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
    },
    {
      "description": "Contournement de la politique de s\u00e9curit\u00e9"
    },
    {
      "description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans OpenSSL. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de code arbitraire \u00e0 distance, un d\u00e9ni de service \u00e0 distance et une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans OpenSSL",
  "vendor_advisories": [
    {
      "published_at": "2026-06-09",
      "title": "Bulletin de s\u00e9curit\u00e9 OpenSSL",
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    }
  ]
}

Sightings

Author	Source	Type	Date

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.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
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.

Action not permitted

CVE-2026-42765 (GCVE-0-2026-42765)

Vulnerability from cvelistv5

CERTFR-2026-AVI-0717

Vulnerability from certfr_avis

Solutions

Tags

Sightings

Nomenclature