JLSEC-2026-1084 Low 2.9

CMS (Cryptographic Message Syntax) parsing in gpgsm in GnuPG through 2.5.20 mishandles the CMS...

JLSEC Published: Jul 31, 2026
Modified: Jul 31, 2026
Severity: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected Packages: GnuPG_jll < 2.5.21+0
Upstream: CVE-2026-57062 GHSA-m6x2-4hhh-669j EUVD-2026-38550

CMS (Cryptographic Message Syntax) parsing in gpgsm in GnuPG through 2.5.20 mishandles the CMS format for AES-GCM because aes-ICVlen is supposed to be 12 bytes but 4 bytes is accepted. NOTE: this is related to CVE-2026-34182.

References

https://blog.calif.io/p/how-to-format-a-ciphertext
https://github.com/advisories/GHSA-m6x2-4hhh-669j
https://nvd.nist.gov/vuln/detail/CVE-2026-57062
https://www.gnupg.org/download
https://www.gnupg.org/download/