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CRITICAL severity

CVE-2020-25489 — py-mini-racer

CRITICALFix: sqreen/PyMiniRacer@627b547

CVE-2020-25489 is a critical-severity (CVSS 9.8) Out-of-bounds Write vulnerability in py-mini-racer. 1 public exploit reference exists, so weaponization risk is real. A fix is available for py-mini-racer — see the affected versions and patch details below.

Heap Overflow in PyMiniRacer

Also known asGHSA-vwcg-7xqw-qcxwPYSEC-2020-93
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.57%1.39%2.20%3.02%1.1%2.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-25489 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍py-mini-racer

Real-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

A heap overflow in Sqreen PyMiniRacer (aka Python Mini Racer) before 0.3.0 allows remote attackers to potentially exploit heap corruption.

More details on https://blog.sqreen.com/vulnerability-disclosure-finding-a-vulnerability-in-sqreens-php-agent-and-how-we-fixed-it/.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIpy-mini-racerall versions0.3.0pip install --upgrade 'py-mini-racer==0.3.0'

Affected Products

1 product · 1 configurations
Application
python mini racersqreen
< 0.3.0
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A heap overflow in Sqreen PyMiniRacer (aka Python Mini Racer) before 0.3…

blog.sqreen.comNVDSep 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for py-mini-racer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update py-mini-racer to 0.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-25489 is resolved across your whole dependency graph.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

A heap overflow in Sqreen PyMiniRacer (aka Python Mini Racer) before 0.3.0 allows remote attackers to potentially exploit heap corruption. More details on https://blog.sqreen.com/vulnerability-disclosure-finding-a-vulnerability-in-sqreens-php-agent-and-how-we-fixed-it/.
O3 Security · Impact-Aware SCA

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CVE-2020-25489: py-mini-racer — Fixed in 0.3.0