MEDIUM5.5

PYSEC-2026-3976

Quick fix

PYSEC-2026-3976 — openssl-encrypt: upgrade to the fixed version with the command below.

pip install --upgrade 'openssl-encrypt>=1.4.6'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/openssl-encrypt

Introduced in: 0Fixed in: 1.4.6

Fixpip install --upgrade 'openssl-encrypt>=1.4.6'

References

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43[ADVISORY]
https://www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor[ADVISORY]