Skip to content
Fencer Vulns
low 3.7

CVE-2026-3832 json

Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted ocsp response

published 2026-04-30 6 mo ago modified 2026-11-06 2 d ago also EUVD-2026-26402

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19
  • Red Hat Red Hat Enterprise Linux 9 0:3.8.10-4.el9_8
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371069, 1791371080, 1791788287, 1791970484
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1789029076, 1791459707, 1791459711, 1791459759, 1791966259
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593
  • Red Hat Red Hat Discovery 2 1782159791, 1782166952
  • Red Hat Red Hat Hardened Images 3.8.13-1.hum1
  • Red Hat Red Hat Update Infrastructure 5 1781525671, 1781525684, 1781525693, 1781525739, 1787135742, 1787241211, 1787241260
  • gnutls28 Debian 13 3.8.9-3+deb13u4
  • gnutls28 Debian 14 3.8.13-1

debian advisories DEBIAN-CVE-2026-3832

  • gnutls28 Ubuntu 22.04 LTS 3.7.3-4ubuntu1.9
  • gnutls28 Ubuntu 24.04 LTS 3.8.3-1.1ubuntu3.6
  • gnutls28 Ubuntu 25.10 3.8.9-3ubuntu2.2
  • gnutls28 Ubuntu 26.04 LTS 3.8.12-2ubuntu1.1
  • gnutls28 Ubuntu Pro FIPS-updates 22.04 LTS 3.7.3-4ubuntu1.9+Fips1
  • gnutls28 Ubuntu Pro FIPS-updates 24.04 LTS 3.8.3-1.1ubuntu3.6+Fips1.2

ubuntu advisories UBUNTU-CVE-2026-3832

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gnutls RHEL 9 3.8.10-4.el9_8
  • gnutls-c++ RHEL 9 3.8.10-4.el9_8
  • gnutls-dane RHEL 9 3.8.10-4.el9_8
  • gnutls-utils RHEL 9 3.8.10-4.el9_8
  • gnutls RHEL 10.2 3.8.10-4.el10_2
  • gnutls-c++ RHEL 10.2 3.8.10-4.el10_2
  • gnutls-dane RHEL 10.2 3.8.10-4.el10_2
  • gnutls-fips RHEL 10.2 3.8.10-4.el10_2

red hat advisories RHSA-2026:26409RHSA-2026:20612RHSA-2026:20613RHSA-2026:13274

  • gnutls openSUSE Tumbleweed 3.8.13-1.1

opensuse advisories openSUSE-SU-2026:10691-1

  • gnutls AlmaLinux 9 3.8.10-4.el9_8
  • gnutls-c++ AlmaLinux 9 3.8.10-4.el9_8
  • gnutls-dane AlmaLinux 9 3.8.10-4.el9_8
  • gnutls-utils AlmaLinux 9 3.8.10-4.el9_8
  • gnutls AlmaLinux 10 3.8.10-4.el10_2
  • gnutls-c++ AlmaLinux 10 3.8.10-4.el10_2
  • gnutls-dane AlmaLinux 10 3.8.10-4.el10_2
  • gnutls-fips AlmaLinux 10 3.8.10-4.el10_2

almalinux advisories ALSA-2026:20612ALSA-2026:20613

  • gnutls Rocky Linux 10 3.8.10-4.el10_2
  • gnutls Rocky Linux 9 3.8.10-4.el9_8

rocky linux advisories RLSA-2026:20613RLSA-2026:20612

  • gnutls Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 3.8.13-r0

alpine advisories ALPINE-CVE-2026-3832

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gnutls Azure Linux 3.0 3.8.3-11

azure linux advisories AZL-85986

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-3832 updated cvss 3.7

gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response

  • Red Hat Enterprise Linux 8 gnutls, gnutls-c++, gnutls-dane, gnutls-utils Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-hypershift-rhel9
    under investigation
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/cert-manager-operator-bundle 1791970484, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82888
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/cert-manager-operator-bundle 1791966259, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-trust-manager-rhel9 1790598593
    fixed: vendor fix RHSA-2026:72502
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1782166952, discovery/discovery-server-rhel9 1782159791
    fixed: vendor fix RHSA-2026:29197
  • Red Hat Enterprise Linux AppStream (v. 9) gnutls-c++ 3.8.10-4.el9_8, gnutls-dane 3.8.10-4.el9_8, gnutls-utils 3.8.10-4.el9_8
    fixed: vendor fix RHSA-2026:20612
  • Red Hat Enterprise Linux AppStream (v. 10) gnutls-c++ 3.8.10-4.el10_2, gnutls-dane 3.8.10-4.el10_2, gnutls-fips 3.8.10-4.el10_2, gnutls-utils 3.8.10-4.el10_2
    fixed: vendor fix RHSA-2026:20613
show 7 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) gnutls-c++ 3.8.9-9.el10_0.19, gnutls-dane 3.8.9-9.el10_0.19, gnutls-fips 3.8.9-9.el10_0.19, gnutls-utils 3.8.9-9.el10_0.19
    fixed: vendor fix RHSA-2026:26409
  • Red Hat Enterprise Linux BaseOS (v. 9) gnutls 3.8.10-4.el9_8
    fixed: vendor fix RHSA-2026:20612
  • Red Hat Enterprise Linux BaseOS (v. 10) gnutls 3.8.10-4.el10_2
    fixed: vendor fix RHSA-2026:20613
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) gnutls 3.8.9-9.el10_0.19
    fixed: vendor fix RHSA-2026:26409
  • Red Hat Hardened Images gnutls 3.8.13-1.hum1, gnutls-c++ 3.8.13-1.hum1, gnutls-dane 3.8.13-1.hum1, gnutls-fips 3.8.13-1.hum1, gnutls-utils 3.8.13-1.hum1, mingw32-gnutls 3.8.13-1.hum1, +1 more
    fixed: vendor fix RHSA-2026:13274
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1781525684, rhui5/rhua-rhel9 1781525739, rhui5/haproxy-rhel9 1781525671, rhui5/rhua-tp-rhel9 1787241260, rhui5/installer-rhel9 1781525693, rhui5/installer-tp-rhel9 1787135742, +1 more
    fixed: vendor fix RHSA-2026:58981
  • Red Hat Enterprise Linux 6 gnutls, gnutls-guile, gnutls-utils Red Hat Enterprise Linux 7 gnutls, gnutls-c++, gnutls-dane, gnutls-utils Red Hat Enterprise Linux AppStream EUS (v. 10.0) gnutls-c++-debuginfo 3.8.9-9.el10_0.19 Red Hat Enterprise Linux BaseOS EUS (v. 10.0) gnutls-c++-debuginfo 3.8.9-9.el10_0.19 Red Hat Update Infrastructure 5 rhui5/cds-tp-rhel9 1787241206, rhui5/cds-kubernetes-rhel9 1781525677
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/gnutls/gnutls/-/issues/1801 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9
  • 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 Update Infrastructure 5
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-179 Incorrect Behavior Order: Early Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.