Is CVE-2026-81687 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-81687?

CVE-2026-81687 has a CVSS v3 severity of MEDIUM (5.5).

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CVE-2026-81687

Description

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.