CVE-2026-43860 Details
Description
mutt before 2.3.2 sometimes truncates the hash_passwd by one byte for IMAP auth_cram MD5 digest.
A vulnerability exists in Mutt versions prior to 2.3.2, where the hash password for IMAP authentication using CRAM-MD5 digest is sometimes truncated by one byte. This issue arises because Mutt incorrectly uses strfcpy() instead of memcpy() on the raw binary value of the MD5 digest, leading to improper handling of passwords containing a null byte. As a result, the authentication process may be compromised, particularly for passwords longer than 64 bytes.
Users can upgrade to Mutt version 2.3.2 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 4, 2026CISA-ADP
Assessed May 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/muttmua/mutt/commit/834c5a2ed0479e51e8662a31caed129f136f4805 | [email protected] | Source CodeVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-193 | Off-by-one Error | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mutt | < 2.3.2 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 4, 2026 | New CVE Received | [email protected] |