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VulnerabilityPublished Updated

CVE-2026-42010: gnutls · Improper Null Termination

Affects gnutlsSource CVE Database V5

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Not known to be exploited · CVSS 7.1 High : upgrade to 3.8.13 soon.

Data as of 29 Oct 2026, 19:15 UTC

CVSS 3.1 base score
7.1High
How severe the flaw is on the 0–10 CVSS scale.

Sources agree

CVSS scores by source
CNA (redhat)CVSS 3.17.1
ADP (redhat-SADP)CVSS 3.17.1
EPSS
1.0% chance of exploitation in 30 days – higher than 64% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.8.13
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 May 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 29 Oct 2026.

What to do

Upgrade gnutls to 3.8.13.

Affected software

ProductAffectedFixed in
gnutlsAffected
  • >=3.6.13 <3.8.13
Fixed in
  • 3.8.13

AI-suggested

Red Hat has released security advisories and updates for gnutls packages addressing this vulnerability, particularly for Red Hat Enterprise Linux 8. Users should apply the latest available updates from Red Hat for their respective systems. For Red Hat Enterprise Linux 10, patch status is not explicitly confirmed in the provided data; therefore, users should monitor the Red Hat advisory page (https://access.redhat.com/security/cve/CVE-2026-42010) for official patch releases and remediation instructions. If you cannot patch yet, consider restricting or monitoring use of RSA-PSK authentication where feasible.

Description

A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.

References

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