What’s Vulnerable › Vulnerabilities

CVE-2023-4874: Undefined Behavior for Input to API in Mutt

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-09 · updated 2026-06-17
• Weakness: CWE-475

Description

Null pointer dereference when viewing a specially crafted email in Mutt >1.5.2 <2.2.12

Affected products

• Debian Linux: 10.0, 11.0, 12.0
• mutt: from 1.5.2 (excl.) before 2.2.12 — fixed in 2.2.12

How to fix

Upgrade to a fixed version: mutt 2.2.12. Check the vendor advisory for mitigations.

References

• https://gitlab.com/muttmua/mutt/-/commit/452ee330e094bfc7c9a68555e5152b1826534555.patch
• https://gitlab.com/muttmua/mutt/-/commit/a4752eb0ae0a521eec02e59e51ae5daedf74fda0.patch
• http://www.openwall.com/lists/oss-security/2023/09/26/6
• https://gitlab.com/muttmua/mutt/-/commit/452ee330e094bfc7c9a68555e5152b1826534555.patch
• https://gitlab.com/muttmua/mutt/-/commit/a4752eb0ae0a521eec02e59e51ae5daedf74fda0.patch
• https://lists.debian.org/debian-lts-announce/2023/09/msg00021.html
• https://www.debian.org/security/2023/dsa-5494

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