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...
- Published
- Jun 23, 2026
- Updated
- Jun 23, 2026
- Assigning CNA
- mitre
- Evidence observed
- Sep 5, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:NLow · next 30 days
- Percentile
- 3.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Proof-of-concept demonstrating a CMS AES-GCM short-tag authentication bypass in GnuPG's gpgsm (CVE-2026-57062). Forges a message that decrypts on vulnerable builds but is rejected on patched versions.
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