CVE-2026-90467

Name	CVE-2026-90467
Description	aiosmtplib before 5.1.3 fails to properly validate email addresses supplied by callers, allowing attackers to inject ESMTP parameters into MAIL FROM and RCPT TO command lines. Attackers can craft malicious addresses containing spaces and angle brackets to append parameters like AUTH, NOTIFY, or ORCPT to envelope commands, forging authenticated identities or forcing delivery notifications to third parties.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1147474

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
aiosmtplib (PTS)	bookworm	2.0.0-1	vulnerable
	trixie	4.0.0-1	vulnerable
	forky, sid	5.1.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
aiosmtplib	source	(unstable)	5.1.3-1			1147474

Notes

[trixie] - aiosmtplib <no-dsa> (Minor issue)
[bookworm] - aiosmtplib <postponed> (Minor issue)
Fixed by: https://github.com/cole/aiosmtplib/commit/2e1b210714974ccc9efd0d09a8f846cb9aeaaec2 (v5.1.3)