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MEDIUM

CVE-2025-32989

CVSS v3

5.3

MEDIUM

EPSS Score

1.5 %

exploit probability, as of 2026-10-15

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • gnutlsAlmaLinux:10all versions · fixed in 3.8.9-9.el10_0.14and 5 other packages
  • gnutlsAlmaLinux:9all versions · fixed in 3.8.3-6.el9_6.2and 4 other packages

Vendor advisories

  • CVE-2025-32989 Red Hat Product Security296 products fixed · 13 known affected

    gnutls: Vulnerability in GnuTLS SCT extension parsing

    gnutls as a component of Red Hat Enterprise Linux 6 · gnutls-devel as a component of Red Hat Enterprise Linux 6 · gnutls-guile as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:7477 Red Hat Product Security17 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

  • RHSA-2025:22529 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Ceph Storage

  • RHSA-2025:19088 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage

  • RHSA-2025:17361 Red Hat Product Security75 products fixed

    Red Hat Security Advisory: gnutls security, bug fix, and enhancement update

  • RHSA-2025:17348 Red Hat Product Security70 products fixed

    Red Hat Security Advisory: gnutls security, bug fix, and enhancement update

5 more advisories

Full record on 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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2025-07-10
Last Modified
2026-05-12

Frequently asked questions

What is CVE-2025-32989?

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.

Is CVE-2025-32989 actively exploited?

Active exploitation of CVE-2025-32989 has not been confirmed. Its EPSS score was 1.5% on 2026-10-15, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-32989?

CVE-2025-32989 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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