{"id":"CVE-2026-84997","summary":"react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU","details":"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.","aliases":["GHSA-x424-64qh-5j54"],"modified":"2026-09-18T03:48:32.029076687Z","published":"2026-09-16T14:07:52.948Z","database_specific":{"cwe_ids":["CWE-835"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84997.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/reactphp/http/releases/tag/v1.11.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84997.json"},{"type":"ADVISORY","url":"https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84997"},{"type":"FIX","url":"https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/reactphp/http","events":[{"introduced":"b5e7d9bfc9effe8ec723af942c66df042ad17fe6"},{"fixed":"b6d4688790adf3797071fcf88a3fc4225f30486a"},{"fixed":"e5b8eb2654dec6cbbc692a39f05ea4ecd40c8cc1"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0.6.0"},{"fixed":"1.11.1"}]}}],"versions":["v1.11.0","v1.10.0","v1.9.0","v1.8.0","v1.7.0","v1.6.0","v1.5.0","v1.4.0","v1.3.0","v1.2.0","v1.1.0","v1.0.0","v0.8.7","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84997.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}