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CRITICAL severity

Improper Input Validation in klonaGHSA-8f89-2fwj-5v5r

CRITICALFix: lukeed/klona@200e8d1

GHSA-8f89-2fwj-5v5r is a critical-severity (CVSS 9.8) Improper Input Validation vulnerability in klona. 1 public exploit reference exists, so weaponization risk is real. A fix is available for klona — see the affected versions and patch details below.

Also known asCVE-2020-8125
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
4.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs91th percentile — riskier than 91% of all scored CVEsHighest risk
0.16%1.78%3.41%5.03%1.1%4.1%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-8f89-2fwj-5v5r by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 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

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

648other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
klonanpm
14.2Mdownloads / week

Description

Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmklonaall versions1.1.1npm install klona@1.1.1

Affected Products

1 product · 1 configurations
Application
klonaklona_project
≤ 1.1.0
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.

Flaw in input validation in npm package klona version 1.1.0 and earlier …

hackerone.comNVDFeb 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 klona, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update klona to 1.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8f89-2fwj-5v5r is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.
O3 Security · Impact-Aware SCA

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Improper Input Validation in klona (Critical 9.8)