VulnerabilityPublished 10 Jul 2025Updated 15 Oct 2026

CVE-2025-32989: Red Hat Enterprise Linux 10 gnutls · Improper Certificate Validation

Affects Red Hat Enterprise Linux 10 gnutlsSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium · fixed in Debian package updates : update the Debian debian/gnutls package when convenient.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 1.4% chance of exploitation in 30 days – higher than 73% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.8.10, 10.3.0, 9.9.0

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

cwe-295

What to do

Upgrade libgnutls to 3.8.10; the Debian debian/gnutls package to 10.3.0 or 9.9.0.

Affected software

Product	Affected	Fixed in
libgnutls	Affected <3.8.10	Fixed in 3.8.10
Debiandebian/gnutls`pkg:deb/debian/gnutls`Other threats	Affected =0 >=9.0.0 <9.9.0 >=10.0.0 <10.3.0	Fixed in 9.9.0 10.3.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

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.

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.

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.

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.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 15 Jul 2026, 11:17 UTC

Technical details

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