---
id: CVE-2026-71980
title: >-
  Belledonne Communications bcg729 through 1.1.2 contains an out-of-bounds read
  vulnerability in the decodeSIDframe() function in src/cng.c that allows
  unauthenticated network-adjacent attackers to trigger a heap read beyond
  buffer boundar…
summary: >-
  Belledonne Communications bcg729 through 1.1.2 contains an out-of-bounds read
  vulnerability in the decodeSIDframe() function in src/cng.c that allows
  unauthenticated network-adjacent attackers to trigger a heap read beyond
  buffer boundar…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
published: '2026-08-17'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:06:30.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71980'
references:
  - url: 'https://github.com/BelledonneCommunications/bcg729/issues/23'
    label: disclosure@vulncheck.com
  - url: 'https://www.linphone.org/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/belledonne-communications-bcg729-out-of-bounds-read-via-decodesidframe
    label: disclosure@vulncheck.com
  - url: 'https://github.com/BelledonneCommunications/bcg729/issues/23'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00609
epssPercentile: 0.46848
ingestedAt: '2026-09-24T20:51:40.205Z'
---

## Overview

Belledonne Communications bcg729 through 1.1.2 contains an out-of-bounds read vulnerability in the decodeSIDframe() function in src/cng.c that allows unauthenticated network-adjacent attackers to trigger a heap read beyond buffer boundaries by sending a zero-length comfort-noise RTP payload. A zero-length payload causes an integer underflow in the uint8_t filter order calculation, which wraps to 255 and is clamped to 10, causing the function to unconditionally read 11 bytes from a zero-byte buffer, resulting in media process termination or silent consumption of adjacent heap memory as reflection coefficients.

## Remediation

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