CVE-2026-74899

Name: CVE-2026-74899
Creator: NVD / NIST
Published: 2026-08-17T11:16:44.917+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.39%

Last modified Aug 28, 2026

CVE-2026-74899 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

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

9.8/10

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

CVSS 4.0

9.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.39%

31.7th percentile

Probability of exploitation in the next 30 days. Learn more

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
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-74899?

How severe is CVE-2026-74899?

CVE-2026-74899 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2026-74899?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST