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MEDIUM severity

CVE-2024-9266 — express

MEDIUM

CVE-2024-9266 is a medium-severity (CVSS 4.7) Open Redirect vulnerability in express. A fix is available for express — see the affected versions and patch details below.

Express Open Redirect vulnerability

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 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 CVEs40th percentile — riskier than 40% of all scored CVEsHighest risk
0.00%0.32%0.64%0.96%0.1%0.5%May 26Sep 26Nov 26

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

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.

109Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
expressnpm
195.5Mdownloads / week

Description

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Express. This vulnerability affects the use of the Express Response object. This issue impacts Express: from 3.4.5 before 4.0.0-rc1.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmexpress≥ 3.4.5&&< 4.0.0-rc14.0.0-rc1npm install express@4.0.0-rc1

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update express to 4.0.0-rc1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-9266 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

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.

Red HatModerate

This flaw is specific to certain versions of Express 3, which has reached end-of-life. No Red Hat products are affected by this vulnerability.

Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Source: Red Hat security advisory for CVE-2024-9266 (CC BY 4.0)

Frequently Asked Questions

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Express. This vulnerability affects the use of the Express Response object. This issue impacts Express: from 3.4.5 before 4.0.0-rc1.
O3 Security · Impact-Aware SCA

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CVE-2024-9266: express Open Redirect — Fixed in 4.0.0-rc1