Belledonne Communications bcg729 up to 1.1.2 src/cng.c decodeSIDframe out-of-bounds

Summaryinfo

A vulnerability was found in Belledonne Communications bcg729 up to 1.1.2 and classified as critical. Impacted is the function decodeSIDframe of the file src/cng.c. The manipulation results in out-of-bounds. This vulnerability is cataloged as CVE-2026-71980. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Belledonne Communications bcg729 up to 1.1.2. Affected is the function decodeSIDframe of the file src/cng.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-71980 since 08/08/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/17/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Belledonne Communications

Name

• bcg729

Version

• 1.1.0
• 1.1.1
• 1.1.2

CPE 2.3info

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CPE 2.2info

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