VULNERABILITY INTELLIGENCE

CVE-2026-81721

CVSS score7.5 HIGH
EPSS probability0.58%
CISA KEVNot currently listed
Published2026-08-27
Last modified2026-09-02
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

openssl_encrypt before 1.4.9 fails to validate KDF cost parameters in encrypted file metadata and keystore headers, allowing attackers to trigger unbounded memory allocation. Attackers can craft malicious encrypted files declaring arbitrarily large Argon2, scrypt, or balloon KDF parameters to exhaust system memory and crash the process without authentication.

Weakness classification

  • disclosure@vulncheck.com: CWE-400

Primary references