CVE-2025-32989 Gnutls: vulnerability in gnutls sct extension parsing
A heap-buffer-overread in GnuTLS allows attackers to expose sensitive data via malformed SCT extensions in X.509 certificates during verification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-32989?
CVE-2025-32989 is a medium-severity vulnerability in Gnu Gnutls, published on 10 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows a malicious user to create a certificate containing a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that contains sensitive data. This issue leads to the exposure of confidential information when GnuTLS verifies certificates from certain websites when the certificate (SCT) is not checked correctly.
Weakness: CWE-295
Which versions are affected by CVE-2025-32989?
It affects 3 products.
Products include Gnu Gnutls, Redhat Enterprise Linux, Redhat Openshift Container Platform.
How do I fix CVE-2025-32989?
Upgrade to a fixed version.
Is CVE-2025-32989 being exploited?
There is no known exploitation of CVE-2025-32989 in the wild and no public exploit code.
Other vulnerabilities in Gnu Gnutls
Sources
Also known as ALPINE-CVE-2025-32989, AZL-65088, AZL-65103, BELL-CVE-2025-32989, CLSA-2025-1766601879, DEBIAN-CVE-2025-32989 and 2 more.