CVE-2019-10735

In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.

• CWE-319

• https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4159Exploit, Issue Tracking, Third Party Advisory
• https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4159Exploit, Issue Tracking, Third Party Advisory

Published

Apr 7, 2019

Last Modified

Jun 17, 2026

Status

Modified

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