# CVE-2026-53701: Gstreamer1-plugins-bad-free: gstreamer: out-of-bounds write in h.266/vvc pps picture partition parser

> A crafted H.266/VVC media file triggers an out-of-bounds write in GStreamer's parser, potentially allowing code execution or denial of service.

- **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
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 11 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-53701, ECHO-adf0-6d60-f6d3, GHSA-2f39-4x7j-f7fp, UBUNTU-CVE-2026-53701

## What is CVE-2026-53701?

CVE-2026-53701 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 11 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An out-of-bounds write vulnerability was found in GStreamer's H.266/VVC PPS picture partition parser in gst-plugins-bad. In the multi-slice-in-tile processing of gst_h266_parser_parse_picture_partition() (gsth266parser.c), the loop iterates without checking that the slice index stays within bounds, writing past three fixed-size arrays (slice_height_in_ctus, slice_top_left_ctu_x, slice_top_left_ctu_y) in the GstH266PPS structure. While the initial proof-of-concept demonstrated a 4-byte out-of-bounds write, the code permits larger writes across multiple iterations. A crafted H.266/VVC media file can trigger this vulnerability.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-53701?


## How do I fix CVE-2026-53701?

Apply the vendor's patch.

## Is CVE-2026-53701 being exploited?

There is no known exploitation of CVE-2026-53701 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53701 and fix it if it is affected.

What it is: CVE-2026-53701 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 11 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-53701 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-2026-53701/ (Markdown: https://insights.sbomify.com/CVE-2026-53701/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53701
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53701
- OSV: https://osv.dev/vulnerability/CVE-2026-53701

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53701/
Summaries are generated and may contain mistakes; the official description above is the record.