CVE-2025-32989Gnutls: vulnerability in gnutls sct extension parsing

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.

Timeline

Scores

EPSS (exploitation in 30 days)

1.5% · top 26% of all CVEs (12 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Affected products

• libgnutls

  • affected < 3.8.10

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:3.8.9-9.el10_0.14 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:3.8.3-6.el9_6.2 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:3.8.3-6.el9_6.2 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:3.7.6-21.el9_2.4 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Extended Update Support

  • unaffected 0:3.8.3-4.el9_4.4 – < *

• Red Hat · Red Hat Ceph Storage 7

  • unaffected 7 – < *

• Red Hat · Red Hat Discovery 2

  • unaffected 2.3.0-1760554384 – < *

• Red Hat · Red Hat Hardened Images

  • unaffected 3.8.12-1.1.hum1 – < *

• Red Hat · Red Hat Insights proxy 1.5

  • unaffected 1.5.7-1759331989 – < *

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unknown

• Red Hat · Red Hat Enterprise Linux 7

  All versions: unknown

• Red Hat · Red Hat Enterprise Linux 8

  All versions: unaffected

• Red Hat · Red Hat OpenShift Container Platform 4

  All versions: affected

• Red Hat · Red Hat OpenShift Container Platform 4

  All versions: affected

What to do

Workaround: Currently, no mitigation is available for this vulnerability.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2025-20927 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-32989](https://cveledger.app/badge/CVE-2025-32989.svg)](https://cveledger.app/cve/CVE-2025-32989)

Record last updated 5 Nov 2026, 14:31 UTC.