Vulnerability DatabaseCVE-2026-87732
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CVE-2026-87732
Published:September 09, 2026
Updated:September 22, 2026
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.
Affected Packages
https://github.com/mirage/mirage-crypto.git (GITHUB):
Affected version(s) >=v1.0.0 <v2.2.0
Fix Suggestion:
Update to version v2.2.0
mirage-crypto (OCAML):
Affected version(s) >=1.0.0 <2.2.0
Fix Suggestion:
Update to version 2.2.0
Related Resources (2)
https://osv.dev/vulnerability/OSEC-2026-12
https://nvd.nist.gov/vuln/detail/CVE-2026-87732
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CVSS v4
Base Score:
6.9
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.2
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Verification of Cryptographic Signature
CWE-347
EPSS
Base Score:
0.08