CVE-2026-81687

MEDIUM 5.5

openssl_encrypt before 1.4.9 Denial of Service via KDF

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400
Vendor	jahlives
Product	openssl_encrypt
Published	Aug 27, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

jahlives / openssl_encrypt

0 < 1.4.9

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-rv6w-7hq9-pr74 vulncheck.com: https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-denial-of-service-via-kdf