CVE-2026-87732

6.2 MEDIUM 0.1% exploit odds No fix listed Crypto Library

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine without logging in. High risk of data tampering.
Exploit odds: 0.1% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-09-09 05:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-09-09 16:04 UTC Last updatedMost recent change to the record

Details

Published: 2026-09-09 05:18 UTC
Last modified: 2026-09-09 16:04 UTC
Exploit probability: 0.1% · EPSS, next 30 days
Weakness: CWE-347
Record status: Deferred

Attack profile CVSS 3.1 · 6.2

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Raw vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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References

NVD record · CVE.org record