{"id":"CVE-2026-74899","aliases":["PYSEC-2026-3727"],"title":"openssl_encrypt versions before 1.4.0 contain a sandbox escape vulnerability in IsolatedPluginExecutor that exposes Python type objects i…","summary":"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_…","severity":"none","vendor":"openssl-encrypt","product":"openssl-encrypt","ecosystem":"pip","affected":["openssl-encrypt < 1.4.0"],"patched":["openssl-encrypt 1.4.0"],"published":"2026-08-17","updated":"2026-08-29","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/PYSEC-2026-3727","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjc"},{"url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-sandbox-escape-via-type-hierarchy"},{"url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-m25m-ggxg-239c"}],"tags":["osv","pip"],"epss":0.00491,"epssPercentile":0.41328,"ingestedAt":"2026-08-29T19:29:14.910Z","slug":"CVE-2026-74899","body":"## Overview\n\nopenssl_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.\n\n## Affected packages\n\n- `openssl-encrypt < 1.4.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `openssl-encrypt 1.4.0`","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}