Description
An issue was discovered in the mirage-crypto package before 2.2.0 for OCaml. The AES.GCM.authenticate_decrypt_into and Chacha20.authenticate_decrypt_into functions write the decrypted plaintext into a caller-provided buffer and only then compares the tag. On a forged tag, the functions returns false, but the destination buffer already holds the full plaintext.
Published: 2026-09-09
Score: 6.2 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories

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References
Link Providers
https://osv.dev/vulnerability/OSEC-2026-12 cve-icon cve-icon
History

Wed, 09 Sep 2026 04:30:00 +0000

Type Values Removed Values Added
Description An issue was discovered in the mirage-crypto package before 2.2.0 for OCaml. The AES.GCM.authenticate_decrypt_into and Chacha20.authenticate_decrypt_into functions write the decrypted plaintext into a caller-provided buffer and only then compares the tag. On a forged tag, the functions returns false, but the destination buffer already holds the full plaintext.
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-09T04:05:10.227Z

Reserved: 2026-09-09T04:03:52.629Z

Link: CVE-2026-87732

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-09T05:18:20.277

Modified: 2026-09-09T05:18:20.277

Link: CVE-2026-87732

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-347

    Improper Verification of Cryptographic Signature