CVE-2025-25200 relates to a security vulnerability identified in Koa, a popular Node.js middleware. Before versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa employed a malicious regex to process `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This flaw poses a significant risk, as it could be exploited to perpetrate Denial-of-Service attacks on affected applications. Immediate updates to the stated versions are recommended to mitigate potential risks.
Koa prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3 utilized a problematic regex for parsing HTTP headers, leading to vulnerability for Denial-of-Service attacks.
The vulnerability CVE-2025-25200 highlights the risks associated with inefficient regular expression complexity, underscoring the importance of rigorous testing in middleware frameworks.
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