CVE-2026-74899CWE-95

CVE-2026-74899

Critical · published August 17, 2026

CVSS v3.1

9.8

EPSS

Percentile

54.4

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 9.8 · CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0: 9.3 · 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
EPSS: 0.00750 · 54.4th percentile
Weakness: CWE-95 · Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Published: 2026-08-17T15:16Z

Affected products (1)

Product	Versions	Fixed in
jahlives/openssl_encrypt	< 1.4.0	1.4.0

References (3)

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-m25m-ggxg-239c · [email protected]https://www.vulncheck.com/advisories/openssl-encrypt-before-sandbox-escape-via-type-hierarchy · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjc · 134c704f-9b21-4f2e-91b3-4a467353bcc0

EPSS history

Timeline

17 AUG 11:04Z
openssl_encrypt before 1.4.0 Sandbox Escape via Type Hierarchy
cvelistv5