This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-87732 →
UBUNTU-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_i...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Ubuntu:22.04:LTS
ocaml-mirage-crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
ocaml-mirage-crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.10
ocaml-mirage-crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
ocaml-mirage-crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- report ubuntu.com
- report cve.org
- report osv.dev