CVE-2026-74899

CriticalCVSS 9.8/10Last modified Aug 28, 2026

Description

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-95

Affected software

Vendor	Product	Versions
jahlives	openssl_encrypt	< 1.4.0

References

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-m25m-ggxg-239cExploit, Mitigation, Vendor Advisory
https://www.vulncheck.com/advisories/openssl-encrypt-before-sandbox-escape-via-type-hierarchyThird Party Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjcNot Applicable

Timeline

Published: Aug 17, 2026
Last modified: Aug 28, 2026
NVD status: Analyzed

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