CVE-2026-87732
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 Sep 9, 2026
- CVSS 6.2 medium
- 0.1% chance of exploitation in the next 30 days (EPSS)
- A fix is available