Improper Verification of Cryptographic Signature Affecting ocaml-mirage-crypto package, versions <2.2.0-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published9 Sept 2026
- disclosed9 Sept 2026
Introduced: 9 Sep 2026
CVE-2026-87732 (opens in a new tab)How to fix?
Upgrade Debian:unstable ocaml-mirage-crypto to version 2.2.0-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ocaml-mirage-crypto package and not the ocaml-mirage-crypto package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.