CVE-2026-74899

openssl_encrypt before 1.4.0 Sandbox Escape via Type Hierarchy

State: Published
Severity: 9.3 Critical
Published: Aug 17, 2026
Updated: Oct 1, 2026
Reserved: Aug 17, 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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Affected Products

Product	Versions
openssl_encryptjahlives	before 1.4.0Affected 1.4.0Not affected

References

GitHub Security Advisory (GHSA-m25m-ggxg-239c)vendor-advisory
VulnCheck Advisory: openssl_encrypt before 1.4.0 Sandbox Escape via Type Hierarchythird-party-advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjcexploit

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