CVE-2026-74871

openssl_encrypt versions before 1.4.6 contain a key derivation flaw in sequential XOR composition mode where the last stage cancels out during key generation. When configured with a single KDF and no prior hashing stage, attackers can bypass memory-hard key derivation and perform offline password cracking at SHA-256 speed instead of the configured KDF cost.

CVSS v3 6.2 MEDIUM

6.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43	Mitigation Vendor Advisory
https://www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:jahlives:openssl_encrypt:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-08-17 11:16

Updated : 2026-09-10 16:56

NVD link : CVE-2026-74871

Mitre link : CVE-2026-74871

CVE.ORG link : CVE-2026-74871

JSON object : View

Products Affected

jahlives

openssl_encrypt

CWE

CWE-916

Use of Password Hash With Insufficient Computational Effort

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