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openssl_encrypt EUVDEUVD-2026-60116

| CVE-2026-74899 CRITICAL
Eval Injection (CWE-95)
2026-08-17 VulnCheck GHSA-5cp4-g2w4-gm8p
Python Information Disclosure Code Injection Openssl Encrypt
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
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/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
vuln.today AI
9.8 CRITICAL

Sandbox escape yields OS command execution on the host running the in-process executor (S:U, C/I/A:H); AV:N/AC:L/PR:N assume the executor is exposed to untrusted plugin input, which the consuming app controls.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Aug 17, 2026 - 13:03 vuln.today
Patch available
Aug 17, 2026 - 12:01 EUVD
CVE Published
Aug 17, 2026 - 11:04 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

Articles & Coverage 2

News 10 New Python Vulnerabilities - 3 Critical, 7 High, 2 With POC Aug 18, 2026 News Critical Sandbox Escape in openssl_encrypt Python Library - CVE-2026-74899 Aug 17, 2026

AnalysisAI

Sandbox escape in the openssl_encrypt Python library (jahlives) before 1.4.0 lets attacker-supplied plugin code break out of the IsolatedPluginExecutor and run arbitrary OS commands. The restricted exec() environment still leaks live Python type objects, so an attacker walks the class hierarchy to reach system primitives despite the intended sandbox. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach the plugin executor interface
Delivery
Submit crafted plugin code
Exploit
Escape restricted exec() via exposed type object
Execution
Traverse __class__.__mro__.__subclasses__() to system class
Impact
Execute arbitrary OS commands as host process
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application actually routes attacker-controlled code through openssl_encrypt's IsolatedPluginExecutor (i.e., the plugin/exec sandbox feature is in use and reachable) on a version before 1.4.0; the specific weakness is that the restricted exec() builtins still expose Python type objects, enabling the __class__.__mro__.__subclasses__() traversal. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are consistent on impact but thin on real-world spread. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker able to submit plugin code to an application that embeds openssl_encrypt's IsolatedPluginExecutor supplies a payload that, from any exposed type object, calls __class__.__mro__.__subclasses__() to locate a class that can spawn processes, then invokes it to run shell commands as the host process user. Because the sandbox is only a restricted exec() rather than an OS boundary, the escape gives full command execution on the host. …
Remediation Upgrade openssl_encrypt to version 1.4.0 or later, which the vendor advisory (GHSA-m25m-ggxg-239c) identifies as the fixed release - Vendor-released patch: 1.4.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all systems and applications using jahlives versions prior to 1.4.0, prioritizing production environments and business-critical systems. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-60116 vulnerability details – vuln.today
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