Buffer Overflow Vulnerability in GnuTLS Library Affects Multiple Applications
CVE-2025-9820

4MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 9
Red Hat Insights Proxy 1.5
Red Hat Update Infrastructure 5
Vendor
CVE Published:
26 January 2026

What is CVE-2025-9820?

A programming flaw within the GnuTLS library, particularly in the gnutls_pkcs11_token_init() function, leads to unsafe handling of PKCS#11 token labels. If a token label exceeds expected length, it results in a buffer overflow that can cause application crashes. This vulnerability may also be exploited to execute arbitrary code under certain conditions, endangering systems reliant on GnuTLS and potentially allowing attackers to escalate privileges or cause denial-of-service conditions.

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Affected Version(s)

Red Hat Enterprise Linux 10 0:3.8.10-3.el10_1

Red Hat Enterprise Linux 9 0:3.8.3-10.el9_7

Red Hat Enterprise Linux 9 0:3.8.3-10.el9_7

References

https://access.redhat.com/errata/RHSA-2026:3477
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:4188
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:4655
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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