Medium [CVE-2025-32989] vulnerability in gnutls sct extension parsing
This medium-severity Red Hat Linux advisory covers CVE-2025-32989 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Extended Update Support.
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Summary
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. Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Weakness: CWE-295.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Extended Update Support; Red Hat Ceph Storage 7; Red Hat Discovery 2; Red Hat Hardened Images; Red Hat Insights proxy 1.5; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat OpenShift Container Platform 4.
Red Hat lists Red Hat Enterprise Linux 8 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Red Hat fixing advisory: RHSA-2025:16115, RHSA-2025:16116, RHSA-2025:17361, RHSA-2025:17348, RHSA-2025:22529, RHSA-2025:19088, RHSA-2026:7477, RHSA-2025:17181.
Affected products named by the advisory: Red Hat package: gnutls.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
- gnutls-0:3.8.9-9.el10_0.14
- gnutls-0:3.8.3-6.el9_6.2
- gnutls-0:3.7.6-21.el9_2.4
- gnutls-0:3.8.3-4.el9_4.4
- rhceph/rhceph-7-rhel9:7
- discovery/discovery-ui-rhel9:2.3.0-1760554384
- gnutls-main-3.8.12-1.1.hum1
- insights-proxy/insights-proxy-container-rhel9:1.5.7-1759331989
- RHSA-2025:16115
- RHSA-2025:16116
- RHSA-2025:17361
- RHSA-2025:17348
- RHSA-2025:22529
- RHSA-2025:19088
- RHSA-2026:7477
- RHSA-2025:17181
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation checklist
- Currently, no mitigation is available for this vulnerability.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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