November 13, 2026 Follow Egret
CVE-2026-3833 · CVE record: PUBLISHED

Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison

, Red Hat Red Hat Enterprise Linux 10, Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On, Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On, Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Red Hat OpenShift Container Platform 4.12, Red Hat Red Hat OpenShift Container Platform 4.13, Red Hat Red Hat OpenShift Container Platform 4.14, Red Hat Red Hat OpenShift Container Platform 4.15, Red Hat Red Hat OpenShift Container Platform 4.16, Red Hat Red Hat OpenShift Container Platform 4.17, Red Hat Red Hat OpenShift Container Platform 4.18, Red Hat Red Hat OpenShift Container Platform 4.19, Red Hat Cert Manager support for Red Hat OpenShift release 1.17, Red Hat Cert Manager support for Red Hat OpenShift release 1.18, Red Hat Cert Manager support for Red Hat OpenShift release 1.20, Red Hat Red Hat Discovery 2, Red Hat Red Hat Hardened Images, Red Hat Red Hat OpenShift AI 3.4, Red Hat Red Hat Update Infrastructure 5, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat OpenShift Container Platform 4

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.

Exploitation evidence

Not listed in the latest downloaded CISA KEV catalog. This does not establish an absence of exploitation.

KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗

Reported products and versions

/

Default status: unaffected

  • affected: 0 to < 3.8.13 (semver)

Red Hat / Red Hat Enterprise Linux 10

Default status: affected

  • unaffected: 0:3.8.10-4.el10_2 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support

Default status: affected

  • unaffected: 0:3.8.9-9.el10_0.19 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support

Default status: affected

  • unaffected: 0:3.3.29-9.el7_9.2 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8

Default status: affected

  • unaffected: 0:3.6.16-8.el8_10.6 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8

Default status: affected

  • unaffected: 0:3.6.16-8.el8_10.6 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Default status: affected

  • unaffected: 0:3.6.14-10.el8_4.1 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Default status: affected

  • unaffected: 0:4.13-3.el8_4.1 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Default status: affected

  • unaffected: 0:3.6.14-10.el8_4.1 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Default status: affected

  • unaffected: 0:4.13-3.el8_4.1 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Default status: affected

  • unaffected: 0:3.6.16-5.el8_6.5 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Default status: affected

  • unaffected: 0:4.13-3.el8_6.2 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Default status: affected

  • unaffected: 0:3.6.16-5.el8_6.5 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Default status: affected

  • unaffected: 0:4.13-3.el8_6.2 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Default status: affected

  • unaffected: 0:3.6.16-7.el8_8.4 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Default status: affected

  • unaffected: 0:4.13-4.el8_8.1 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Default status: affected

  • unaffected: 0:3.6.16-7.el8_8.4 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Default status: affected

  • unaffected: 0:4.13-4.el8_8.1 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 9

Default status: affected

  • unaffected: 0:3.8.10-4.el9_8 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 9

Default status: affected

  • unaffected: 0:3.8.10-4.el9_8 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Default status: affected

  • unaffected: 0:3.7.6-21.el9_2.7 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Default status: affected

  • unaffected: 0:3.8.3-4.el9_4.6 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support

Default status: affected

  • unaffected: 0:3.8.3-6.el9_6.4 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.12

Default status: affected

  • unaffected: 412.86.202608241157-0 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.13

Default status: affected

  • unaffected: 413.92.202609080414-0 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.14

Default status: affected

  • unaffected: 414.92.202609011250-0 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.15

Default status: affected

  • unaffected: 415.92.202609140326-0 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.16

Default status: affected

  • unaffected: 416.94.202609011112-0 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.17

Default status: affected

  • unaffected: 417.94.202608250221-0 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.18

Default status: affected

  • unaffected: 418.94.202609031320-0 to < * (rpm)

Red Hat / Red Hat OpenShift Container Platform 4.19

Default status: affected

  • unaffected: 4.19.9.6.202608182320-0 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.17

Default status: affected

  • unaffected: 1791371080 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.17

Default status: affected

  • unaffected: 1791371069 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.17

Default status: affected

  • unaffected: 1791788287 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.17

Default status: affected

  • unaffected: 1791970484 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.18

Default status: affected

  • unaffected: 1791459707 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.18

Default status: affected

  • unaffected: 1791459711 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.18

Default status: affected

  • unaffected: 1791459759 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.18

Default status: affected

  • unaffected: 1789029076 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.18

Default status: affected

  • unaffected: 1791966259 to < * (rpm)

Red Hat / Cert Manager support for Red Hat OpenShift release 1.20

Default status: affected

  • unaffected: 1790598593 to < * (rpm)

Red Hat / Red Hat Discovery 2

Default status: affected

  • unaffected: 1782159791 to < * (rpm)

Red Hat / Red Hat Discovery 2

Default status: affected

  • unaffected: 1782166952 to < * (rpm)

Red Hat / Red Hat Hardened Images

Default status: affected

  • unaffected: 3.8.13-1.hum1 to < * (rpm)

Red Hat / Red Hat OpenShift AI 3.4

Default status: affected

  • unaffected: 1790703542 to < * (rpm)

Red Hat / Red Hat Update Infrastructure 5

Default status: affected

  • unaffected: 1781525684 to < * (rpm)

Red Hat / Red Hat Update Infrastructure 5

Default status: affected

  • unaffected: 1781525671 to < * (rpm)

Red Hat / Red Hat Update Infrastructure 5

Default status: affected

  • unaffected: 1781525693 to < * (rpm)

Red Hat / Red Hat Update Infrastructure 5

Default status: affected

  • unaffected: 1781525739 to < * (rpm)

Red Hat / Red Hat Update Infrastructure 5

Default status: affected

  • unaffected: 1787241211 to < * (rpm)

Red Hat / Red Hat Update Infrastructure 5

Default status: affected

  • unaffected: 1787135742 to < * (rpm)

Red Hat / Red Hat Update Infrastructure 5

Default status: affected

  • unaffected: 1787241260 to < * (rpm)

Red Hat / Red Hat Enterprise Linux 6

Default status: unaffected

Red Hat / Red Hat OpenShift Container Platform 4

Default status: unknown

Fixes and workarounds

No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.

Reported workarounds: 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.

Sources and related reporting

CVE Program record ↗ · Download tracked evidence as JSON

Monitored source mentions

Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.

Observed change timeline

History begins when Egret first downloads each source. It is not the complete upstream CVE history.

12 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-12",
  "epss": 0.00565,
  "percentile": 0.47422
}
10 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-10",
  "epss": 0.00565,
  "percentile": 0.47261
}
09 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-09",
  "epss": 0.00565,
  "percentile": 0.47206
}
08 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-08",
  "epss": 0.00565,
  "percentile": 0.47187
}
07 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-07",
  "epss": 0.00565,
  "percentile": 0.47162
}
06 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-06",
  "epss": 0.00565,
  "percentile": 0.47101
}
06 Nov 2026, 18:20 Jerusalem · CVE Program record changed

Stored CNA snapshot at this observation.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-3833",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-30T18:37:27.251775Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-30T18:37:57.245Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://gitlab.com/gnutls/gnutls/-/issues/1803"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "packageName": "gnutls",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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          "versions": [
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              "versionType": "rpm"
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          ]
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        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux_eus:10.0"
          ],
          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
          "vendor": "Red Hat",
          "versions": [
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              "status": "unaffected",
              "version": "0:3.8.9-9.el10_0.19",
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        },
        {
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          "cpes": [
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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": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:3.6.16-8.el8_10.6",
              "versionType": "rpm"
            }
          ]
        },
        {
          "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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          "defaultStatus": "affected",
          "packageName": "gnutls",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:3.6.16-8.el8_10.6",
              "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": "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"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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            "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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          "defaultStatus": "affected",
          "packageName": "libtasn1",
          "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.13-3.el8_4.1",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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          "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"
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          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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          "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
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          "versions": [
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              "status": "unaffected",
              "version": "0:4.13-3.el8_4.1",
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          "versions": [
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06 Nov 2026, 06:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
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04 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
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03 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

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03 Nov 2026, 02:22 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

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}
03 Nov 2026, 02:22 Jerusalem · CVE Program record changed

Stored CNA snapshot at this observation.

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    "dateReserved": "2026-03-09T14:00:51.698Z",
    "dateUpdated": "2026-10-14T19:24:09.620Z",
    "state": "PUBLISHED"
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}
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