CVE-2026-24881

Name	CVE-2026-24881
Description	In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key can cause a stack-based buffer overflow in gpg-agent during PKDECRYPT--kem=CMS handling. This can easily be leveraged for denial of service; however, there is also memory corruption that could lead to remote code execution.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
gnupg2 (PTS)	bullseye	2.2.27-2+deb11u2	fixed
	bullseye (security)	2.2.27-2+deb11u3	fixed
	bookworm	2.2.40-1.1+deb12u2	fixed
	trixie	2.4.7-21+deb13u1	fixed
	forky, sid	2.4.8-5	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
gnupg2	source	(unstable)	(not affected)

- gnupg2 <not-affected> (Vulnerable code not present)
https://dev.gnupg.org/T8044