Bug 2345319 (CVE-2025-25200)

Summary: CVE-2025-25200 koa: Koa has Inefficient Regular Expression Complexity
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: abarbaro, cdaley, jchui, jhe, ktsao, nboldt, psrna
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A denial of service flaw was found in the koa library. An improperly designed regex is used to parse some specific HTTP headers. If untrusted requests are passed to koa, it can cause excessive resource usage on the server.
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Description OSIDB Bzimport 2025-02-12 19:01:31 UTC 
Koa is expressive middleware for Node.js using ES2017 async functions. Prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This can be exploited to carry out a Denial-of-Service attack. Versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3 fix the issue.