{"id":"CVE-2026-84997","state":"PUBLISHED","title":"react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU","description":"react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. From 0.6.0 until 1.11.1, React\\Http\\Io\\ChunkedDecoder could enter an infinite loop while processing a malformed Transfer-Encoding: chunked body because handleData required its buffer to shrink on every iteration. An incomplete terminal-chunk trailer without CRLF left the buffer unchanged after strpos returned false, and exactly two non-CRLF bytes after a completed non-terminal chunk bypassed both the error and wait guards. The affected decoder processes request bodies for React\\Http\\HttpServer and response bodies for React\\Http\\Browser, allowing a malicious client to freeze a server or a malicious or compromised server to freeze a client. A reverse proxy that normalizes inbound requests may protect the server direction but does not protect outbound Browser requests. This issue is fixed in version 1.11.1.","publishedAt":"2026-09-16T14:07:52.948Z","updatedAt":"2026-09-16T14:46:47.220Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["reactphp http"],"affected":[{"vendor":"reactphp","product":"http","versions":[{"version":">= 0.6.0, < 1.11.1","status":"affected"}]}],"references":["https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54","https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a","https://github.com/reactphp/http/releases/tag/v1.11.1"],"weaknesses":["CWE-835"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/84xxx/CVE-2026-84997.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84997","state":"PUBLISHED","datePublished":"2026-09-16T14:07:52.948Z","dateUpdated":"2026-09-16T14:46:47.220Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-02T18:12:13.535Z"},"containers":{"cna":{"title":"react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU","descriptions":[{"lang":"en","value":"react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. From 0.6.0 until 1.11.1, React\\Http\\Io\\ChunkedDecoder could enter an infinite loop while processing a malformed Transfer-Encoding: chunked body because handleData required its buffer to shrink on every iteration. An incomplete terminal-chunk trailer without CRLF left the buffer unchanged after strpos returned false, and exactly two non-CRLF bytes after a completed non-terminal chunk bypassed both the error and wait guards. The affected decoder processes request bodies for React\\Http\\HttpServer and response bodies for React\\Http\\Browser, allowing a malicious client to freeze a server or a malicious or compromised server to freeze a client. A reverse proxy that normalizes inbound requests may protect the server direction but does not protect outbound Browser requests. This issue is fixed in version 1.11.1."}],"affected":[{"vendor":"reactphp","product":"http","versions":[{"version":">= 0.6.0, < 1.11.1","status":"affected"}]}],"references":[{"url":"https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54","name":"https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a","name":"https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a","tags":["x_refsource_MISC"]},{"url":"https://github.com/reactphp/http/releases/tag/v1.11.1","name":"https://github.com/reactphp/http/releases/tag/v1.11.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-835","lang":"en","description":"CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-16T14:07:52.948Z"},"source":{"advisory":"GHSA-x424-64qh-5j54","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T14:46:36.400582Z","id":"CVE-2026-84997","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-16T14:46:47.220Z"}}]}}}