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MEDIUM severity

CVE-2020-8910 — google-closure-library

MEDIUMFix: google/closure-library@294fc00

CVE-2020-8910 is a medium-severity (CVSS 6.5) CWE-625 vulnerability in google-closure-library. A fix is available for google-closure-library — see the affected versions and patch details below.

Improper Input Validation in Google Closure Library

Also known asGHSA-vh5w-fg69-rc8m
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk
0.00%0.35%0.69%1.04%0.1%0.5%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-8910 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.

55other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
google-closure-librarynpm
31Kdownloads / week

Description

A URL parsing issue in goog.uri of the Google Closure Library versions up to and including v20200224 allows an attacker to send malicious URLs to be parsed by the library and return the wrong authority. Mitigation -- update your library to version v20200315.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmgoogle-closure-libraryall versions20200315.0.0npm install google-closure-library@20200315.0.0

Affected Products

1 product · 1 configurations
Application
closure librarygoogle
< 20200315
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update google-closure-library to 20200315.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-8910 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

A URL parsing issue in goog.uri of the Google Closure Library versions up to and including v20200224 allows an attacker to send malicious URLs to be parsed by the library and return the wrong authority. Mitigation -- update your library to version v20200315.
O3 Security · Impact-Aware SCA

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CVE-2020-8910: google-closure — Fixed in 20200315.0.0