SimpleEval: Objects (including modules) can leak dangerous modules through to direct access inside the sandboxGHSA-44vg-5wv2-h2hg
CRITICALGHSA-44vg-5wv2-h2hg is a critical-severity (CVSS 9.8) Code Injection vulnerability in simpleeval. A fix is available for simpleeval — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-44vg-5wv2-h2hg.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
simpleevalReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
If the objects passed in as names to SimpleEval have modules or other disallowed / dangerous objects available as attrs.
Additionally, dangerous functions or modules could be accessed by passing them as callbacks to other safe functions to call.
Examples (found by @ByamB4):
Any module where non-underscore attribute chains reach os or sys:
- os.path, pathlib, shutil, glob (direct .os / .sys attributes)
- statistics (has .sys)
- numpy (has .ctypeslib.os and .f2py.sys)
- urllib.parse (has .warnings.sys)
Patches
The latest version 1.0.5 has this issue fixed.
Workarounds
Don't pass in objects or modules which have direct attributes to potentially dangerous items. Use a wrapper to wrap the potentially vulnerable items (See the ModuleWrapper in version 1.0.5)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | simpleeval | all versions | 1.0.5pip install --upgrade 'simpleeval==1.0.5' |
Affected Products
simpleevaldanthedeckieDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for simpleeval, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update simpleeval to 1.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-44vg-5wv2-h2hg is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenShift AI 2.25 | rhoai/odh-training-cuda121-torch24-py311-rhel9:1776243258 | RHSA-2026:10184 |
| Red Hat OpenShift AI 3.3 | rhoai/odh-trustyai-nemo-guardrails-server-rhel9:1782471606 | RHSA-2026:37275 |
Frequently Asked Questions
Is GHSA-44vg-5wv2-h2hg in your dependencies?
Find it across PyPI, including transitive dependencies.