CVE-2026-43859 Details
Description
mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.
A vulnerability exists in Mutt versions prior to 2.3.2 in the way the IMAP CRAM-MD5 authentication digest is processed. The issue arises because the application sometimes uses strfcpy instead of memcpy, leading to potential truncation of the password hash. This flaw occurs in the auth_cram module when the password length exceeds the MD5 block size, causing the digest to be incorrectly handled. The vulnerability has been acknowledged but is not widely reported, likely due to the declining use of CRAM-MD5 and the rarity of passwords longer than 64 bytes.
Users can upgrade to Mutt version 2.3.2 or later, where this vulnerability has been addressed.
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-158 | Improper Neutralization of Null Byte or NUL Character | [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] |