CVE-2026-71980: Out-of-bounds Read in BelledonneCommunications bcg729
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.
AI Analysis
Technical Summary
CVE-2026-71980 describes an out-of-bounds read in the decodeSIDframe() function of bcg729 through version 1.1.2. When a zero-length comfort-noise RTP payload is received, an integer underflow occurs in the uint8_t filter order calculation, wrapping to 255 and clamped to 10. This causes the function to read 11 bytes from a zero-byte buffer, resulting in heap memory being read beyond its boundary. The impact includes termination of media processing or silent consumption of adjacent heap memory as reflection coefficients. The vulnerability is exploitable by unauthenticated network-adjacent attackers.
Potential Impact
The vulnerability allows unauthenticated network-adjacent attackers to cause a heap out-of-bounds read, which can terminate media processing or silently corrupt adjacent heap memory. This may lead to denial of service or unpredictable behavior in applications using the affected library.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor vendor communications for updates and consider mitigating exposure by filtering or blocking suspicious RTP payloads if feasible.
CVE-2026-71980: Out-of-bounds Read in BelledonneCommunications bcg729
Description
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.
CVSS v4.0
Score 8.7high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-71980 describes an out-of-bounds read in the decodeSIDframe() function of bcg729 through version 1.1.2. When a zero-length comfort-noise RTP payload is received, an integer underflow occurs in the uint8_t filter order calculation, wrapping to 255 and clamped to 10. This causes the function to read 11 bytes from a zero-byte buffer, resulting in heap memory being read beyond its boundary. The impact includes termination of media processing or silent consumption of adjacent heap memory as reflection coefficients. The vulnerability is exploitable by unauthenticated network-adjacent attackers.
Potential Impact
The vulnerability allows unauthenticated network-adjacent attackers to cause a heap out-of-bounds read, which can terminate media processing or silently corrupt adjacent heap memory. This may lead to denial of service or unpredictable behavior in applications using the affected library.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor vendor communications for updates and consider mitigating exposure by filtering or blocking suspicious RTP payloads if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-08T16:43:04.178Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a834becbf8831d5394ecf82
Added to database: 08/17/2026, 17:59:08 UTC
Last enriched: 08/17/2026, 18:11:27 UTC
Last updated: 08/17/2026, 18:26:57 UTC
Views: 4
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