CVE-2025-32989: Improper Certificate Validation
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.
AI Analysis
Technical Summary
This vulnerability arises from improper certificate validation in GnuTLS when parsing the SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) in X.509 certificates. Specifically, a heap-buffer-overread occurs if a certificate contains a malformed SCT extension, potentially exposing confidential information during certificate verification. The flaw impacts GnuTLS versions shipped with Red Hat Enterprise Linux 9 and 10 prior to the patched releases. Red Hat has issued security advisories (RHSA-2025:16115 and RHSA-2025:16116) providing updates that fix this vulnerability along with other related GnuTLS issues.
Potential Impact
The vulnerability can lead to exposure of sensitive information due to improper parsing of malformed SCT extensions in certificates. The CVSS v3.1 base score is 5.3 (medium severity), with the impact vector indicating network attack vector, low attack complexity, no privileges required, no user interaction, and confidentiality impact only. There is no indication of integrity or availability impact. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released official security updates for GnuTLS that address this vulnerability. Users of Red Hat Enterprise Linux 9 and 10 should apply the relevant security advisories RHSA-2025:16115 and RHSA-2025:16116 to update GnuTLS packages to fixed versions. The advisories provide detailed instructions on applying these updates. No additional mitigation is required beyond applying the official patches.
CVE-2025-32989: Improper Certificate Validation
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 v3.1
Score 5.3medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper certificate validation in GnuTLS when parsing the SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) in X.509 certificates. Specifically, a heap-buffer-overread occurs if a certificate contains a malformed SCT extension, potentially exposing confidential information during certificate verification. The flaw impacts GnuTLS versions shipped with Red Hat Enterprise Linux 9 and 10 prior to the patched releases. Red Hat has issued security advisories (RHSA-2025:16115 and RHSA-2025:16116) providing updates that fix this vulnerability along with other related GnuTLS issues.
Potential Impact
The vulnerability can lead to exposure of sensitive information due to improper parsing of malformed SCT extensions in certificates. The CVSS v3.1 base score is 5.3 (medium severity), with the impact vector indicating network attack vector, low attack complexity, no privileges required, no user interaction, and confidentiality impact only. There is no indication of integrity or availability impact. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released official security updates for GnuTLS that address this vulnerability. Users of Red Hat Enterprise Linux 9 and 10 should apply the relevant security advisories RHSA-2025:16115 and RHSA-2025:16116 to update GnuTLS packages to fixed versions. The advisories provide detailed instructions on applying these updates. No additional mitigation is required beyond applying the official patches.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- redhat
- Date Reserved
- 2025-04-15T01:31:12.104Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/errata/RHSA-2025:16115","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2025:16116","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2025:17181","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2025:17348","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2025:17361","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2025:19088","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2025:22529","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:7477","vendor":"Red Hat"},{"url":"https://access.redhat.com/security/cve/CVE-2025-32989","vendor":"Red Hat"}]
Threat ID: 686f76caa83201eaaca669d2
Added to database: 07/10/2025, 08:16:10 UTC
Last enriched: 07/15/2026, 11:17:29 UTC
Last updated: 09/10/2026, 19:36:50 UTC
Views: 324
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