openssl_encrypt versions before 1.4.9 fail to enforce a time ceiling on key derivation function iteration counts specified in file metadata. Attackers can craft files with extremely high KDF iteration counts to consume CPU resources for unbounded periods before password verification occurs.
HIGH
Vulnerability intelligence
CVE-2026-81687
CVSS 4.08.7
SeverityHigh
Known exploitedNo
NVD references:
Primary source: NIST National Vulnerability Database