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Description

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.

PUBLISHED Reserved 2026-06-23 | Published 2026-06-23 | Updated 2026-06-23 | Assigner mitre




LOW: 2.9CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-1284 Improper Validation of Specified Quantity in Input

Product status

Default status
unknown

Any version
affected

References

blog.calif.io/p/how-to-format-a-ciphertext

www.gnupg.org/download/

cve.org (CVE-2026-57062)

nvd.nist.gov (CVE-2026-57062)

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