---
id: CVE-2026-121626
title: GNU Gatekeeper before 5.16 Out-of-Bounds Read in H.460.24 RTCP Probe Handler
summary: >-
  GNU Gatekeeper (gnugk) before 5.16 contains an out-of-bounds read
  vulnerability in H46024Socket::ReceivedProbePacket() that allows remote
  attackers to cause a heap over-read by sending short probe packets. Attackers
  can send a short appl…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-125
vendor: willamowius
product: gnugk
affected:
  - gnugk < 5.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-07T03:19:14.533230Z'
published: '2026-11-03'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T03:19:22.751Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121626'
references:
  - url: >-
      https://github.com/willamowius/gnugk/commit/160aa27344ecc9a443cccaa63e8d7fa95a766610
    label: Patch Commit
  - url: 'https://github.com/willamowius/gnugk/releases/tag/v5_16'
    label: gnugk v5_16 Release Notes
  - url: 'https://github.com/willamowius/gnugk/blob/v5_15/GkClient.cxx#L963-L990'
  - url: 'https://github.com/willamowius/gnugk'
  - url: >-
      https://www.vulncheck.com/advisories/gnu-gatekeeper-before-5.16-out-of-bounds-read-in-h-460.24-rtcp-probe-handler
    label: >-
      VulnCheck Advisory: GNU Gatekeeper before 5.16 Out-of-Bounds Read in
      H.460.24 RTCP Probe Handler
tags:
  - cve.org
epss: 0.00338
epssPercentile: 0.27394
ingestedAt: '2026-11-05T20:33:06.317Z'
---

## Overview

GNU Gatekeeper (gnugk) before 5.16 contains an out-of-bounds read vulnerability in H46024Socket::ReceivedProbePacket() that allows remote attackers to cause a heap over-read by sending short probe packets. Attackers can send a short application-defined RTCP packet to the media port during H.460.24 probing to read past the heap allocation and possibly crash the gatekeeper.

## Affected

- `gnugk < 5.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.