# CVE-2026-12706: Ffmpeg: ffmpeg: heap use-after-free read in rasc decoder decode_move()

> A use-after-free in FFmpeg's RASC decoder allows attackers to cause a denial of service via a crafted AVI file.

- **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:** 19 Jun 2026
- **Updated:** 22 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-12706, GHSA-qh4m-69pj-9vc2, OESA-2026-2827, OESA-2026-2828, UBUNTU-CVE-2026-12706, openSUSE-SU-2026:11361-1

## What is CVE-2026-12706?

CVE-2026-12706 is a medium-severity use after free vulnerability in Red Hat Enterprise Linux AI (RHEL AI) 3, published on 19 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

A use-after-free vulnerability was found in FFmpeg's RASC video decoder. The decode_move() function initializes a read pointer into a decompressed buffer, but a subsequent reallocation of that same buffer during move-table processing leaves the pointer dangling. An attacker could exploit this by providing a specially crafted AVI file containing a malicious RASC video stream. When a user opens or plays the file, the decoder reads from freed heap memory, which could lead to a denial of service (crash).

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2026-12706?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ffmpeg-7` | openSUSE:Tumbleweed | All versions | 7.1.4-5.1 |

## How do I fix CVE-2026-12706?

Apply the vendor's patch.

## Is CVE-2026-12706 being exploited?

There is no known exploitation of CVE-2026-12706 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12706 and fix it if it is affected.

What it is: CVE-2026-12706 is a medium-severity use after free vulnerability in Red Hat Enterprise Linux AI (RHEL AI) 3, published on 19 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-2026-12706 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux AI (RHEL AI) 3. 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-2026-12706/ (Markdown: https://insights.sbomify.com/CVE-2026-12706/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12706
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12706
- OSV: https://osv.dev/vulnerability/CVE-2026-12706

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12706/
Summaries are generated and may contain mistakes; the official description above is the record.