CVE-2026-87732

6.2 mediumEPSS 0.1%

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.

Severity

CVSS 3.1

6.2 medium

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

EPSS: 0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-31)
CWE: CWE-347
Published: 2026-09-09
Modified: 2026-09-09
Record from: the NVD, synced 2026-10-19

References

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

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