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HIGH severity

Denial of Service in http-proxyGHSA-6x33-pw7p-hmpq

HIGHFix: http-party/node-http-proxy#1447

GHSA-6x33-pw7p-hmpq is a high-severity (CVSS 7.5) vulnerability in http-proxy. A fix is available for http-proxy — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Jan 29, 2024 · OSV.dev, FIRST.org (EPSS)

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.

3Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
http-proxynpm
31.1Mdownloads / week

Description

Versions of http-proxy prior to 1.18.1 are vulnerable to Denial of Service. An HTTP request with a long body triggers an ERR_HTTP_HEADERS_SENT unhandled exception that crashes the proxy server. This is only possible when the proxy server sets headers in the proxy request using the proxyReq.setHeader function.

For a proxy server running on http://localhost:3000, the following curl request triggers the unhandled exception:
curl -XPOST http://localhost:3000 -d "$(python -c 'print("x"*1025)')"

Recommendation

Upgrade to version 1.18.1 or later

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmhttp-proxyall versions1.18.1npm install http-proxy@1.18.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update http-proxy to 1.18.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-6x33-pw7p-hmpq 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

Versions of `http-proxy` prior to 1.18.1 are vulnerable to Denial of Service. An HTTP request with a long body triggers an `ERR_HTTP_HEADERS_SENT` unhandled exception that crashes the proxy server. This is only possible when the proxy server sets headers in the proxy request using the `proxyReq.setHeader` function. For a proxy server running on `http://localhost:3000`, the following curl request triggers the unhandled exception: ```curl -XPOST http://localhost:3000 -d "$(python -c 'print("x"*1025)')"``` ## Recommendation Upgrade to version 1.18.1 or later
O3 Security · Impact-Aware SCA

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Denial of Service in http-proxy (High 7.5)