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PYSEC-2026-3727

Quick fix

PYSEC-2026-3727 — 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 contain a sandbox escape vulnerability in IsolatedPluginExecutor that exposes Python type objects in restricted exec() builtins. Attackers can traverse the Python class hierarchy via __class__.__mro__.__subclasses__() to access system functions and execute arbitrary OS commands.

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/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjc[ADVISORY]
https://www.vulncheck.com/advisories/openssl-encrypt-before-sandbox-escape-via-type-hierarchy[ADVISORY]
https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-m25m-ggxg-239c[EVIDENCE]