PYSEC-2026-3727

vendorUSosv

view advisory published 2026-08-17Licence: CC-BY-4.0

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-74899US	—	0.75% (55th)	—	2026-08-17
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…

references

External citations — patches, advisories, analysis.

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-m25m-ggxg-239cEVIDENCE
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjcADVISORY
https://www.vulncheck.com/advisories/openssl-encrypt-before-sandbox-escape-via-type-hierarchyADVISORY

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