Bug 2464857 (CVE-2026-43859)

Summary: CVE-2026-43859 mutt: Mutt: Low integrity impact in IMAP authentication due to cryptographic digest mishandling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in mutt, an email client, where it mishandles cryptographic digests used for IMAP (Internet Message Access Protocol) authentication. This incorrect handling could lead to a low integrity impact, potentially allowing a remote attacker to subtly affect the authentication process.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-04 07:01:27 UTC
mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.