What’s Vulnerable › Vulnerabilities

CVE-2022-36032: ReactPHP's HTTP server parses encoded cookie names so malicious `__Host-` and `__Secure-` cookies can be sent

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-09-06 · updated 2026-06-17
• Weakness: CWE-20

Description

ReactPHP HTTP is a streaming HTTP client and server implementation for ReactPHP. In ReactPHP's HTTP server component versions starting with 0.7.0 and prior to 1.7.0, when ReactPHP is processing incoming HTTP cookie values, the cookie names are url-decoded. This may lead to cookies with prefixes like `__Host-` and `__Secure-` confused with cookies that decode to such prefix, thus leading to an attacker being able to forge cookie which is supposed to be secure. This issue is fixed in ReactPHP HTTP version 1.7.0. As a workaround, Infrastructure or DevOps can place a reverse proxy in front of the ReactPHP HTTP server to filter out any unexpected `Cookie` request headers.

Affected products

• reactphp http: from 0.7.0 before 1.7.0 — fixed in 1.7.0

How to fix

Upgrade to a fixed version: reactphp http 1.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/reactphp/http/commit/663c9a3b77b71463fa7fcb76a6676ffd16979dd6
• https://github.com/reactphp/http/pull/175
• https://github.com/reactphp/http/releases/tag/v1.7.0
• https://github.com/reactphp/http/security/advisories/GHSA-w3w9-vrf5-8mx8
• https://github.com/reactphp/http/commit/663c9a3b77b71463fa7fcb76a6676ffd16979dd6
• https://github.com/reactphp/http/pull/175
• https://github.com/reactphp/http/releases/tag/v1.7.0
• https://github.com/reactphp/http/security/advisories/GHSA-w3w9-vrf5-8mx8

Get alerted when CVE-2022-36032 or the next vulnerability affects your stack