Vulnerability · Published Apr 30, 2026 · Assigned by redhat
CVE-2026-3832Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted ocsp response
Low 3.7
In plain English
A low-severity security flaw in gnutls. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | gnutls | 3.8.10-4.el10_2 | ALSA-2026:20613 |
| AlmaLinux:9 | gnutls | 3.8.10-4.el9_8 | ALSA-2026:20612 |
| AlmaLinux:10 | gnutls-c++ | 3.8.10-4.el10_2 | ALSA-2026:20613 |
| AlmaLinux:9 | gnutls-c++ | 3.8.10-4.el9_8 | ALSA-2026:20612 |
| AlmaLinux:10 | gnutls-dane | 3.8.10-4.el10_2 | ALSA-2026:20613 |
| AlmaLinux:9 | gnutls-dane | 3.8.10-4.el9_8 | ALSA-2026:20612 |
| AlmaLinux:10 | gnutls-devel | 3.8.10-4.el10_2 | ALSA-2026:20613 |
| AlmaLinux:9 | gnutls-devel | 3.8.10-4.el9_8 | ALSA-2026:20612 |
| AlmaLinux:10 | gnutls-fips | 3.8.10-4.el10_2 | ALSA-2026:20613 |
| AlmaLinux:10 | gnutls-utils | 3.8.10-4.el10_2 | ALSA-2026:20613 |
| AlmaLinux:9 | gnutls-utils | 3.8.10-4.el9_8 | ALSA-2026:20612 |
| Alpine:v3.20 | gnutls | 3.8.13-r0 | ALPINE-CVE-2026-3832 |
| Alpine:v3.21 | gnutls | 3.8.13-r0 | ALPINE-CVE-2026-3832 |
| Alpine:v3.22 | gnutls | 3.8.13-r0 | ALPINE-CVE-2026-3832 |
| Alpine:v3.23 | gnutls | 3.8.13-r0 | ALPINE-CVE-2026-3832 |
| Alpine:v3.24 | gnutls | 3.8.13-r0 | ALPINE-CVE-2026-3832 |
| Debian:13 | gnutls28 | 3.8.9-3+deb13u4 | DEBIAN-CVE-2026-3832 |
| Debian:14 | gnutls28 | 3.8.13-1 | DEBIAN-CVE-2026-3832 |
| Rocky Linux:10 | gnutls | 0:3.8.10-4.el10_2 | RLSA-2026:20613 |
| Rocky Linux:9 | gnutls | 0:3.8.10-4.el9_8 | RLSA-2026:20612 |
| Ubuntu:22.04:LTS | gnutls28 | 3.7.3-4ubuntu1.9 | UBUNTU-CVE-2026-3832 |
| Ubuntu:24.04:LTS | gnutls28 | 3.8.3-1.1ubuntu3.6 | UBUNTU-CVE-2026-3832 |
| Ubuntu:25.10 | gnutls28 | 3.8.9-3ubuntu2.2 | UBUNTU-CVE-2026-3832 |
| Ubuntu:26.04:LTS | gnutls28 | 3.8.12-2ubuntu1.1 | UBUNTU-CVE-2026-3832 |
Affected products (as reported)
Weakness: CWE-179 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- RHSA-2026:13274 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:20612 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:20613 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:26319 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:26409 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:29197 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:58981 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:72502 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82304 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82322 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82347 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82354 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82372 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82857 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82888 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-3832 vdb-entry, x_refsource_REDHAT
- RHBZ#2445762 issue-tracking, x_refsource_REDHAT
- https://gitlab.com/gnutls/gnutls/-/issues/1801