Description
The gnutls_ocsp_resp_check_crt function in lib/x509/ocsp.c in GnuTLS before 3.4.15 and 3.5.x before 3.5.4 does not verify the serial length of an OCSP response, which might allow remote attackers to bypass an intended certificate validation mechanism via vectors involving trailing bytes left by gnutls_malloc.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnutls28 | 3.5.3-4 | — |
| Debian 13 | gnutls28 | 3.5.3-4 | — |
| Debian 12 | gnutls28 | 3.5.3-4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | gnutls28 | 3.4.10-4ubuntu1.2 | USN-3183-1 |
| Ubuntu 14.04 LTS | gnutls26 | 2.12.23-12ubuntu2.6 | USN-3183-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | gnutls +4 | 3.3.26-9.el7 | RHSA-2017:2292 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | gnutls | 3.2.15-16.1 | SUSE-SU-2017:0348-1 |
| SLES 12 SP1 | gnutls | 3.2.15-16.1 | SUSE-SU-2017:0348-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | gnutls | 3.2.15-16.1 | SUSE-SU-2017:0348-1 |
| SLES for SAP 12 SP1 | gnutls | 3.2.15-16.1 | SUSE-SU-2017:0348-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.2 | gnutls | 3.4.5-r1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | gnutls +4 | 3.3.26-9.el7 | ELSA-2017-2292 |
Advisories 6
- RHSA-2017:2292 Red Hat Security Advisory: gnutls security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3183-1 gnutls26, gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2017:0348-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- VDE-2019-009 PHOENIX CONTACT: Multiple Vulnerabilities in AXC F 2152 CERT@VDE · May 22, 2025
- ICSA-19-155-01 PHOENIX CONTACT PLCNext AXC F 2152 CISA ICS & IT advisories · Jun 4, 2019
- ELSA-2017-2292 Moderate: gnutls security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 7, 2017
References
- 92893 vdb-entry
- https://gitlab.com/gnutls/gnutls/commit/964632f37dfdfb914ebc5e49db4fa29af35b1de9
- RHSA-2017:2292 vendor-advisory
- openSUSE-SU-2017:0386 vendor-advisory
- [gnutls-devel] 20160902 OCSP certificate check mailing-list
- https://www.gnutls.org/security.html