CVE-2026-57062

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.

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• gnupg2 2.4.9-5 https://blog.calif.io/p/how-to-format-a-ciphertext Fixed by: https://github.com/gpg/gnupg/commit/4c7e68cf3d335328821bdbb70db309a60d0e4fd4