Denial of Service in http-proxy
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- Security bypass
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-693.
Summary
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
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | http-proxy (npm) | before 1.18.1 | 1.18.1 | Patch available | GHSA-6x33-pw7p-hmpq |
- http-proxy (npm) Vendor— Affected before 1.18.1 Fixed in 1.18.1 Patch available GHSA-6x33-pw7p-hmpq
Remediation
- Fix · GHSA-6x33-pw7p-hmpq http-proxy (npm) Fixed in 1.18.1 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-6x33-pw7p-hmpq
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences