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CVE-2025-9820VulnerabilityPublished Updated

Red Hat Security Advisory: gnutls security update

Affects Red Hat gnutlsSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2025-9820· Medium 4.0

Not known to be exploited · CVSS 4.0 Medium : upgrade the Red Hat redhat/gnutls package to 10.2 when convenient.

Data as of 5 Nov 2026, 18:33 UTC

CVSS 3.1 base score
4.0Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 10.2
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 5 Nov 2026.

What to do

Upgrade the Red Hat redhat/gnutls package to 10.2.

Affected software

ProductAffectedFixed in
gnutlsAffected
  • 3.8.1 – 3.8.10
10 affected builds
Fixed in–
Red Hatredhat/gnutlspkg:rpm/redhat/gnutlsOther threatsAffected
  • <10.2
Fixed in
  • 10.2

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 an official security update for GnuTLS in Red Hat Enterprise Linux 8 that addresses these vulnerabilities. Users should apply the update as described in Red Hat advisory RHSA-2026:5585. The update packages are available for multiple architectures. No additional mitigation steps are indicated beyond applying the official patch.

Description

Two security vulnerabilities were identified in the GnuTLS library used by Red Hat Enterprise Linux 8. One is a stack-based buffer overflow in the gnutls_pkcs11_token_init() function (CVE-2025-9820), and the other is a denial of service vulnerability caused by excessive resource consumption during certificate verification (CVE-2025-14831). Red Hat has issued a security update to address these issues.

References

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