What’s Vulnerable › Vulnerabilities

CVE-2026-71980: Belledonne Communications bcg729 1.1.2 Out-of-Bounds Read via decodeSIDframe()

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-17 · updated 2026-10-23
• Weakness: CWE-125

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.

Affected products

• BelledonneCommunications bcg729: through 1.1.2

References

• https://github.com/BelledonneCommunications/bcg729/issues/23
• https://www.linphone.org/
• https://www.vulncheck.com/advisories/belledonne-communications-bcg729-out-of-bounds-read-via-decodesidframe
• https://github.com/BelledonneCommunications/bcg729/issues/23

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