# CVE-2026-125703: Gst-plugins-bad: gst-plugins-bad: bounds check errors in mxf vanc packet handling


- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 10 Nov 2026
- **Updated:** 12 Nov 2026
- **Also known as:** DEBIAN-CVE-2026-125703, ECHO-260d-2047-a5f5, GHSA-wq95-fg67-jvc5, UBUNTU-CVE-2026-125703

## What is CVE-2026-125703?

CVE-2026-125703 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 10 Nov 2026. 

### Official description

A flaw was found in the GStreamer gst-plugins-bad MXF plugin. Insufficient bounds checks when parsing crafted VANC data can cause an out-of-bounds read in the demuxer, while an incorrect buffer size calculation when muxing multiple ancillary packets can cause an out-of-bounds write. Processing affected content may crash the application, resulting in a denial of service.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-125703?


## How do I fix CVE-2026-125703?

Upgrade to a fixed version.

## Is CVE-2026-125703 being exploited?

There is no known exploitation of CVE-2026-125703 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-125703 and fix it if it is affected.

What it is: CVE-2026-125703 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 10 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-125703 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. 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-2026-125703/ (Markdown: https://insights.sbomify.com/CVE-2026-125703/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-125703
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-125703
- OSV: https://osv.dev/vulnerability/CVE-2026-125703

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-125703/
Summaries are generated and may contain mistakes; the official description above is the record.