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CVE-2026-87732

MEDIUM
6.2
CVSS Score
Published: September 9, 2026 at 04:03 AM UTC
Updated: September 9, 2026 at 05:27 PM UTC
1 product affected across 1 vendorMirage Crypto

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Severity
MEDIUM6.2
Exploit prediction
EPSS 0.1%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mirage Crypto· Ocaml
60%
v < 2.2.0
Affected range stops below 2.2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord
https://osv.dev/vulnerability/OSEC-2026-12

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.2MEDIUMmitre
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-347

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