Out-of-bounds Read in Belledonnecommunications Bcg729
CVE-2026-71980
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Belledonnecommunications Bcg729 — versions 0
Weakness classification (CWE)
References
- github.com/BelledonneCommunications/bcg729/issues/23 (issue-tracking)
- www.linphone.org/ (product)
- www.vulncheck.com/advisories/belledonne-communications-bcg729-out-of-bounds-rea… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-71980?
- CVE-2026-71980 is a high-severity vulnerability in Belledonnecommunications Bcg729, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-08-17.
- How severe is CVE-2026-71980?
- High severity. CVSS v3 base score is 7.5 out of 10.