# CVE-2026-100231: Memory corruption in Red Hat Enterprise Linux 10

> Heap out-of-bounds write in GStreamer ASF muxer allows attackers to cause denial of service or memory corruption via crafted media metadata.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-100231, ECHO-dda0-5778-e5cc, GHSA-qxfv-rjq3-mg7m, UBUNTU-CVE-2026-100231

## What is CVE-2026-100231?

CVE-2026-100231 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A flaw was found in the GStreamer multimedia framework's ASF muxer plugin (asfmux). When writing string metadata tags containing Unicode characters outside the Basic Multilingual Plane (such as emoji) to an ASF container, the plugin incorrectly calculates the buffer size needed for the UTF-16LE representation. The size calculation assumes each Unicode code point requires 2 bytes, but non-BMP characters require 4 bytes (surrogate pairs). This leads to a heap out-of-bounds write when the actual UTF-16LE conversion is written into the undersized buffer. An attacker could exploit this by providing media with crafted metadata tags to an application that transcodes or remuxes to ASF format while preserving metadata, potentially causing a denial of service or limited memory corruption.

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

## Which versions are affected by CVE-2026-100231?


## How do I fix CVE-2026-100231?

No fix has been published for CVE-2026-100231 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-100231 being exploited?

There is no known exploitation of CVE-2026-100231 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100231 and fix it if it is affected.

What it is: CVE-2026-100231 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-100231 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-2026-100231/ (Markdown: https://insights.sbomify.com/CVE-2026-100231/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100231
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100231
- OSV: https://osv.dev/vulnerability/CVE-2026-100231

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100231/
Summaries are generated and may contain mistakes; the official description above is the record.