VulnerabilityDeferred

CVE-2026-87732

An issue was discovered in the mirage-crypto package before 2.2.0 for OCaml.

MEDIUM 6.2EPSS 0.08%

Does this matter?

Lower severity and a low EPSS score (0.08%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.2 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS: 0.08% probability · 0th percentile
CISA KEV: Not listed
Weakness: CWE-347
Source: cve@mitre.org

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.