CVE-2026-33308: Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS

Q: How do I fix CVE-2026-33308?

mod gnutls: upgrade to 0.13.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33308 being exploited?

CVE-2026-33308 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33308 affect?

CVE-2026-33308 affects mod gnutls. Severity is medium (CVSS 6.8). Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Prior to version 0.13.0, code for client certificate verification did not check the key purpose as set in the Extended Key Usage extension. An attacker with access to the private

Q: How urgent is CVE-2026-33308?

Priority 37/100. Remotely exploitable, no login, no user action; On your watchlist

Routine

MEDIUM 6.8REMOTEWATCHLISTUPGRADE

CVE-2026-33308 is a medium-severity flaw (CVSS 6.8) affecting mod gnutls. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Prior to version 0.13.0, code for client certificate verification did not check the key purpose as set in the Extended Key Usage extension. An attacker with access to the private key for a valid certificate issued by a CA trusted for TLS client authentication but designated for a different purpose could have used that certificate to improperly access resources requiring TLS client authe

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: mod gnutls project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 03:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

mod gnutls project mod gnutls UPGRADE

Affected: < 0.13.0

Fixed in: 0.13.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mod-gnutls || rpm -q mod-gnutls || mod-gnutls --version

2. UPGRADE to 0.13.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mod-gnutls

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mod-gnutls

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33308?

mod gnutls: upgrade to 0.13.0. Exact commands for each OS are on this page.

Is CVE-2026-33308 being exploited?

CVE-2026-33308 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33308 affect?

CVE-2026-33308 affects mod gnutls. Severity is medium (CVSS 6.8). Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Prior to version 0.13.0, code for client certificate verification did not check the key purpose as set in the Extended Key Usage extension. An attacker with access to the private

How urgent is CVE-2026-33308?

Priority 37/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache HTTP Server vulnerabilities · GnuTLS vulnerabilities

Related CVEs

CVE-2026-33307 HIGH 7.5 UPGRADE Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS

References

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