CVE-2026-26017 (GCVE-0-2026-26017)
Vulnerability from cvelistv5
Published
2026-03-06 15:36
Modified
2026-07-15 01:15
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Summary
CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plugin, resulting in a Time-of-Check Time-of-Use (TOCTOU) flaw. This issue has been patched in version 1.14.2.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-26017",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-06T16:06:32.284525Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-06T16:06:41.093Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"affected": [
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:acm:2.13::el9"
],
"defaultStatus": "affected",
"packageName": "rhacm2/lighthouse-agent-rhel9",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.13",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1782924920",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:acm:2.13::el9"
],
"defaultStatus": "affected",
"packageName": "rhacm2/lighthouse-coredns-rhel9",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.13",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1782924937",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:acm:2.14::el9"
],
"defaultStatus": "affected",
"packageName": "rhacm2/lighthouse-agent-rhel9",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.14",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1780204232",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:acm:2.14::el9"
],
"defaultStatus": "affected",
"packageName": "rhacm2/lighthouse-coredns-rhel9",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.14",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1780204249",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:acm:2.15::el9"
],
"defaultStatus": "affected",
"packageName": "rhacm2/lighthouse-coredns-rhel9",
"product": "Red Hat Advanced Cluster Management for Kubernetes 2.15",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1774086225",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:connectivity_link:1"
],
"defaultStatus": "affected",
"packageName": "rhcl-1/coredns-rhel9",
"product": "Red Hat Connectivity Link 1",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:openshift:4"
],
"defaultStatus": "unaffected",
"packageName": "openshift4/ose-coredns-rhel9",
"product": "Red Hat OpenShift Container Platform 4",
"vendor": "Red Hat"
}
],
"datePublic": "2026-03-06T15:36:15.655Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in CoreDNS, a DNS server that uses a chain of plugins. This logical vulnerability allows an attacker to bypass DNS access controls. The issue occurs because security plugins, such as \u0027acl\u0027, are evaluated before the \u0027rewrite\u0027 plugin, creating a Time-of-Check Time-of-Use (TOCTOU) flaw. This flaw enables an attacker to circumvent intended access restrictions."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Important"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-367",
"description": "Time-of-check Time-of-use (TOCTOU) Race Condition",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-15T01:15:36.058Z",
"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"shortName": "redhat-SADP"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-26017"
},
{
"name": "RHBZ#2445244",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445244"
},
{
"tags": [
"x_sadp-csaf-vex"
],
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:36873"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:25127"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:8151"
}
],
"solutions": [
{
"lang": "en",
"value": "RHSA-2026:36873: Red Hat Advanced Cluster Management for Kubernetes 2.13"
},
{
"lang": "en",
"value": "RHSA-2026:25127: Red Hat Advanced Cluster Management for Kubernetes 2.14"
},
{
"lang": "en",
"value": "RHSA-2026:8151: Red Hat Advanced Cluster Management for Kubernetes 2.15"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-06T16:01:45.971Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-03-06T15:36:15.655Z",
"value": "Made public."
}
],
"title": "github.com/coredns/coredns: CoreDNS: DNS access control bypass due to plugin execution order flaw",
"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_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
}
],
"cna": {
"affected": [
{
"product": "coredns",
"vendor": "coredns",
"versions": [
{
"status": "affected",
"version": "\u003c 1.14.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plugin, resulting in a Time-of-Check Time-of-Use (TOCTOU) flaw. This issue has been patched in version 1.14.2."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-367",
"description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-06T15:36:15.655Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr"
},
{
"name": "https://github.com/coredns/coredns/releases/tag/v1.14.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coredns/coredns/releases/tag/v1.14.2"
}
],
"source": {
"advisory": "GHSA-c9v3-4pv7-87pr",
"discovery": "UNKNOWN"
},
"title": "CoreDNS ACL Bypass"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-26017",
"datePublished": "2026-03-06T15:36:15.655Z",
"dateReserved": "2026-02-09T21:36:29.554Z",
"dateUpdated": "2026-07-15T01:15:36.058Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"github.com/coredns/coredns: CoreDNS: DNS access control bypass due to plugin execution order flaw\", \"metrics\": [{\"other\": {\"type\": \"Red Hat severity rating\", \"content\": {\"value\": \"Important\", \"namespace\": \"https://access.redhat.com/security/updates/classification/\"}}}, {\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 7.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"cpes\": [\"cpe:/a:redhat:acm:2.13::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.13\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1782924920\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhacm2/lighthouse-agent-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:acm:2.13::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.13\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1782924937\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhacm2/lighthouse-coredns-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:acm:2.14::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.14\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1780204232\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhacm2/lighthouse-agent-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:acm:2.14::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.14\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1780204249\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhacm2/lighthouse-coredns-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:acm:2.15::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Advanced Cluster Management for Kubernetes 2.15\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1774086225\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhacm2/lighthouse-coredns-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:connectivity_link:1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Connectivity Link 1\", \"packageName\": \"rhcl-1/coredns-rhel9\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4\", \"packageName\": \"openshift4/ose-coredns-rhel9\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-03-06T16:01:45.971Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-03-06T15:36:15.655Z\", \"value\": \"Made public.\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"RHSA-2026:36873: Red Hat Advanced Cluster Management for Kubernetes 2.13\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:25127: Red Hat Advanced Cluster Management for Kubernetes 2.14\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:8151: Red Hat Advanced Cluster Management for Kubernetes 2.15\"}], \"x_adpType\": \"supplier\", \"datePublic\": \"2026-03-06T15:36:15.655Z\", \"references\": [{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-26017\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2445244\", \"name\": \"RHBZ#2445244\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26017.json\", \"tags\": [\"x_sadp-csaf-vex\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:36873\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:25127\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:8151\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}], \"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\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in CoreDNS, a DNS server that uses a chain of plugins. This logical vulnerability allows an attacker to bypass DNS access controls. The issue occurs because security plugins, such as \u0027acl\u0027, are evaluated before the \u0027rewrite\u0027 plugin, creating a Time-of-Check Time-of-Use (TOCTOU) flaw. This flaw enables an attacker to circumvent intended access restrictions.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-367\", \"description\": \"Time-of-check Time-of-use (TOCTOU) Race Condition\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-15T01:15:36.058Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-26017\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-06T16:06:32.284525Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-06T16:06:35.183Z\"}}], \"cna\": {\"title\": \"CoreDNS ACL Bypass\", \"source\": {\"advisory\": \"GHSA-c9v3-4pv7-87pr\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 7.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"coredns\", \"product\": \"coredns\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.14.2\"}]}], \"references\": [{\"url\": \"https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr\", \"name\": \"https://github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87pr\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/coredns/coredns/releases/tag/v1.14.2\", \"name\": \"https://github.com/coredns/coredns/releases/tag/v1.14.2\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plugin, resulting in a Time-of-Check Time-of-Use (TOCTOU) flaw. This issue has been patched in version 1.14.2.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-367\", \"description\": \"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-06T15:36:15.655Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-26017\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-15T01:15:36.058Z\", \"dateReserved\": \"2026-02-09T21:36:29.554Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-03-06T15:36:15.655Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
Loading…