CVE-2026-24881

EUVD-2026-4768
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.1 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
mitreCNA
8.1 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 32%
Affected Products (NVD)
VendorProductVersion
gnupggnupg
2.5.13 ≤
𝑥
< 2.5.17
gpg4wingpg4win
5.0.0 ≤
𝑥
< 5.0.1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
gnupg2
bookworm
2.2.40-1.1+deb12u2
fixed
bullseye
2.2.27-2+deb11u2
fixed
bullseye (security)
2.2.27-2+deb11u3
fixed
forky
2.4.8-5
fixed
sid
2.4.8-5
fixed
trixie
2.4.7-21+deb13u1
fixed
Common Weakness Enumeration
References
https://dev.gnupg.org/T8044
https://www.openwall.com/lists/oss-security/2026/01/27/8