CVE-2026-74871 openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR

What is CVE-2026-74871?

CVE-2026-74871 is a medium-severity vulnerability in Jahlives Openssl Encrypt, published on 17 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-916

Which versions are affected by CVE-2026-74871?

1 open source package ship an affected version, including openssl-encrypt. It affects 1 product.

Products include Jahlives Openssl Encrypt.

How do I fix CVE-2026-74871?

Upgrade openssl-encrypt to 1.4.6 or later.

Is CVE-2026-74871 being exploited?

There is no known exploitation of CVE-2026-74871 in the wild and no public exploit code.

Other vulnerabilities in Jahlives Openssl Encrypt

• CVE-2026-81680 openssl_encrypt before 1.4.9 Authentication Bypass via Recovery Slot Removal Critical 9.3
• CVE-2026-81681 openssl_encrypt before 1.4.9 False Encryption via Cleartext Storage Critical 9.3
• CVE-2026-81685 openssl_encrypt before 1.4.9 Text Injection via Recovery Slot Metadata Critical 9.3
• CVE-2026-81694 openssl-encrypt before 1.4.9 Output Injection via Unsanitized Filenames in verify-usb Command Critical 9.3
• CVE-2026-81695 openssl_encrypt before 1.4.9 Terminal Injection via key_id Critical 9.3

All Jahlives Openssl Encrypt vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-pj8r-rv9w-cfg8, GHSA-vxf9-vwp6-2w43, PYSEC-2026-3976.