Critical severity9.8OSV Advisory· Published Aug 17, 2026· Updated Aug 28, 2026
CVE-2026-74899
CVE-2026-74899
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2<1.4.0+ 1 more
- (no CPE)range: <1.4.0
- (no CPE)
Patches
Vulnerability mechanics
References
3- github.com/jahlives/openssl_encrypt/security/advisories/GHSA-m25m-ggxg-239cnvdExploitMitigationVendor Advisory
- www.vulncheck.com/advisories/openssl-encrypt-before-sandbox-escape-via-type-hierarchynvdThird Party Advisory
- github.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjcnvdNot Applicable
News mentions
1- Jahlives openssl_encrypt: 25 Critical Flaws Including Auth Bypass and Sandbox Escapes Disclosed TogetherVypr Intelligence · Aug 17, 2026