CVE-2026-87732 in mirage-crypto

Summary

by MITRE • 09/09/2026

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.

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• Responsible: MITRE
• Reservation: 09/09/2026
• Disclosure: 09/09/2026
• Moderation: accepted
• Entry: VDB-401528
• CPE: ready
• CWE: CWE-311 (confirmed)
• CVSS: 6.2 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: very low

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-87732
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-87732
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-87732/