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PYSEC-2026-3764

Quick fix

PYSEC-2026-3764 — openssl-encrypt: upgrade to the fixed version with the command below.

pip install --upgrade 'openssl-encrypt>=1.4.0'

Details

openssl_encrypt versions before 1.4.0 use a non-standard PBKDF2 key derivation construction with iterations=1 per call in an outer loop, creating a KDF whose security properties have not been formally analyzed. Attackers can exploit this weakened key derivation to more efficiently crack passwords protecting legacy encrypted files compared to standard PBKDF2 implementations.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/openssl-encrypt

Introduced in: 0Fixed in: 1.4.0

Fixpip install --upgrade 'openssl-encrypt>=1.4.0'

References

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-743f-89fg-x288[ADVISORY]
https://www.vulncheck.com/advisories/openssl-encrypt-before-non-standard-pbkdf2-key-derivation[ADVISORY]