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Back to active CVEs
Medium · CVSS 6.3CVE-2026-121625

GNU Gatekeeper before 5.16 Out-of-Bounds Read via RTCP SDES ParsingCVE-2026-121625

Answer in brief

CVE-2026-121625 records a Medium severity (CVSS 6.3) vulnerability in GNU Gatekeeper before 5.16 Out-of-Bounds Read via RTCP SDES Parsing. The current sources do not mark it as known exploited. The current feed maps willamowius/gnugk (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps willamowius/gnugk (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
willamowius/gnugkgeneric>=0 <5.165.16

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for willamowius/gnugk.
  2. 2Review the reported fix. Update willamowius/gnugk to 5.16 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

GNU Gatekeeper (gnugk) before 5.16 contains an out-of-bounds read vulnerability in ParseRTCP() in ProxyChannel.cxx that allows remote RTP peers to read heap memory past received packets. Attackers can send RTCP SDES items lacking a NUL byte to the media proxy port during proxied H.323 calls with EnableRTCPStats enabled, crashing the gatekeeper.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • GNU Gatekeeper before 5.16 Out-of-Bounds Read in H.460.24 RTCP Probe HandlerSame willamowius/gnugk package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-125
Source
CVE List V5
Source checked
Nov 3, 2026
References
5 linked sources
Open source record