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.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
GnuPG GnuPG unknown
Version Status Constraints
0 affected ≤ 2.5.20

No data.

No data.

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Vendors Products
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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://blog.calif.io/p/how-to-format-a-ciphertext cve-icon
https://www.gnupg.org/download/ cve-icon
History

Tue, 23 Jun 2026 19:15:00 +0000

Type Values Removed Values Added
Title CMS Parser Accepts Invalid AES‑GCM ICV Length in GnuPG gpgsm

Tue, 23 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
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.
First Time appeared Gnupg
Gnupg gnupg
Weaknesses CWE-1284
CPEs cpe:2.3:a:gnupg:gnupg:*:*:*:*:*:*:*:*
Vendors & Products Gnupg
Gnupg gnupg
References
Metrics cvssV3_1

{'score': 2.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-23T17:35:30.113Z

Reserved: 2026-06-23T17:26:24.801Z

Link: CVE-2026-57062

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-23T20:15:04Z

Weaknesses