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

> Attackers can cause denial of service or leak heap memory by sending zero-length RTP payloads to the bcg729 audio codec library.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** GHSA-r839-2gfx-g34h

## What is CVE-2026-71980?

CVE-2026-71980 is a high-severity vulnerability in BelledonneCommunications bcg729, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-71980?


## How do I fix CVE-2026-71980?

No fix has been published for CVE-2026-71980 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-71980 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-71980 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-71980 and fix it if it is affected.

What it is: CVE-2026-71980 is a high-severity vulnerability in BelledonneCommunications bcg729, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-71980 exists.

Affected product: BelledonneCommunications bcg729. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-71980/ (Markdown: https://insights.sbomify.com/CVE-2026-71980/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-71980
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-71980
- OSV: https://osv.dev/vulnerability/CVE-2026-71980

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-71980/
Summaries are generated and may contain mistakes; the official description above is the record.