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Vulnerability record · CVE-2025-32989 · published 10 July 2025

CVE-2025-32989: Gnutls improper certificate validation vulnerability

Gnu · Gnutls

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.

5.3 CVSS 3.1 Medium EPSS 1.3% · top 31.0% CWE-295 · Improper certificate validation
5.3CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
13References
1 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2359621 Issue Tracking
https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html
http://www.openwall.com/lists/oss-security/2025/07/11/3
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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Source: NIST National Vulnerability Database (record CVE-2025-32989), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.