{"id":"CVE-2025-25200","state":"PUBLISHED","title":"Koa has Inefficient Regular Expression Complexity","description":"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.","publishedAt":"2025-02-12T17:59:04.615Z","updatedAt":"2025-02-12T19:29:10.232Z","severity":{"score":9.2,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["koajs koa"],"affected":[{"vendor":"koajs","product":"koa","versions":[{"version":"< 0.21.2","status":"affected"},{"version":">= 1.0.0, < 1.7.1","status":"affected"},{"version":">= 2.0.0-alpha.1, < 2.15.4","status":"affected"},{"version":">= 3.0.0-alpha.0, < < 3.0.0-alpha.3","status":"affected"}]}],"references":["https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m","https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c","https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32","https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08","https://github.com/koajs/koa/blob/master/lib/request.js#L259","https://github.com/koajs/koa/blob/master/lib/request.js#L404","https://github.com/koajs/koa/releases/tag/2.15.4"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:08:47.682Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/25xxx/CVE-2025-25200.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-25200","state":"PUBLISHED","datePublished":"2025-02-12T17:59:04.615Z","dateUpdated":"2025-02-12T19:29:10.232Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-02-03T19:30:53.400Z"},"containers":{"cna":{"title":"Koa has Inefficient Regular Expression Complexity","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"koajs","product":"koa","versions":[{"version":"< 0.21.2","status":"affected"},{"version":">= 1.0.0, < 1.7.1","status":"affected"},{"version":">= 2.0.0-alpha.1, < 2.15.4","status":"affected"},{"version":">= 3.0.0-alpha.0, < < 3.0.0-alpha.3","status":"affected"}]}],"references":[{"url":"https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m","name":"https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c","name":"https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c","tags":["x_refsource_MISC"]},{"url":"https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32","name":"https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32","tags":["x_refsource_MISC"]},{"url":"https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08","name":"https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08","tags":["x_refsource_MISC"]},{"url":"https://github.com/koajs/koa/blob/master/lib/request.js#L259","name":"https://github.com/koajs/koa/blob/master/lib/request.js#L259","tags":["x_refsource_MISC"]},{"url":"https://github.com/koajs/koa/blob/master/lib/request.js#L404","name":"https://github.com/koajs/koa/blob/master/lib/request.js#L404","tags":["x_refsource_MISC"]},{"url":"https://github.com/koajs/koa/releases/tag/2.15.4","name":"https://github.com/koajs/koa/releases/tag/2.15.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"HIGH","baseScore":9.2,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-02-12T17:59:04.615Z"},"source":{"advisory":"GHSA-593f-38f6-jp5m","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-02-12T18:33:35.286450Z","id":"CVE-2025-25200","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-02-12T19:29:10.232Z"}}]}}}