amphp/http-client Header leakage on cross-domain redirectsGHSA-8jp9-mpv9-98rj
MEDIUMFix: amphp/http-client@fa79253GHSA-8jp9-mpv9-98rj is a medium-severity (CVSS 4) vulnerability in amphp/http-client. A fix is available for amphp/http-client — see the affected versions and patch details below.
Real-World Exposure
amphp/http-clientReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
amphp/http-client has a security weakness that might leak sensitive request headers from the initial request to the redirected host on cross-domain redirects, which were not removed correctly. Message::setHeaders does not replace the entire set of headers, but only operates on the headers matching the given array keys.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | amphp/http-client | ≥ 4.0.0&&< 4.4.0 | 4.4.0composer require amphp/http-client:^4.4.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for amphp/http-client, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update amphp/http-client to 4.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8jp9-mpv9-98rj is resolved across your whole dependency graph.
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
Is GHSA-8jp9-mpv9-98rj in your dependencies?
Find it across Packagist, including transitive dependencies.