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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.

🗓️ 27 Jun 2026 08:05:11Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 5 Views

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01 Jul 2026 21:47Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.12.9 - 9.1
EPSS0.00237
SSVC
5