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HIGH severity

CVE-2020-1920 — react-native

HIGHFix: facebook/react-native@ca09ae8

CVE-2020-1920 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in react-native. A fix is available for react-native — see the affected versions and patch details below.

Regular expression denial of service in react-native

Also known asGHSA-7f53-fmmv-mfjv
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs71th percentile — riskier than 71% of all scored CVEsHighest risk
0.00%0.62%1.24%1.86%0.2%1.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-1920 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs 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.

7Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
react-nativenpm
14.3Mdownloads / week

Description

A regular expression denial of service (ReDoS) vulnerability in the validateBaseUrl function can cause the application to use excessive resources, become unresponsive, or crash. This was introduced in react-native version 0.59.0 and fixed in version 0.64.1.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
📦npmreact-native≥ 0.59.0&&< 0.62.30.62.3npm install react-native@0.62.3
📦npmreact-native≥ 0.63.0&&< 0.64.10.64.1npm install react-native@0.64.1

Affected Products

1 product · 1 configurations
Application
react-nativefacebook
≥ 0.59.0 && < 0.64.1
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 react-native, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update react-native to 0.62.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-1920 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

A regular expression denial of service (ReDoS) vulnerability in the validateBaseUrl function can cause the application to use excessive resources, become unresponsive, or crash. This was introduced in react-native version 0.59.0 and fixed in version 0.64.1.
O3 Security · Impact-Aware SCA

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CVE-2020-1920: react-native DoS — Fixed in 0.62.3