CVE-2026-84997

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-84997", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-02T18:12:13.535Z", "datePublished": "2026-09-16T14:07:52.948Z", "dateUpdated": "2026-09-16T14:46:47.220Z"}, "containers": {"cna": {"title": "react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU", "problemTypes": [{"descriptions": [{"cweId": "CWE-835", "lang": "en", "description": "CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')", "type": "CWE"}]}], "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"}}], "references": [{"name": "https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54"}, {"name": "https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a", "tags": ["x_refsource_MISC"], "url": "https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a"}, {"name": "https://github.com/reactphp/http/releases/tag/v1.11.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/reactphp/http/releases/tag/v1.11.1"}], "affected": [{"vendor": "reactphp", "product": "http", "versions": [{"version": ">= 0.6.0, < 1.11.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-16T14:07:52.948Z"}, "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."}], "source": {"advisory": "GHSA-x424-64qh-5j54", "discovery": "UNKNOWN"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-16T14:46:47.220Z"}}]}}

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{"affected": [{"affectedData": [{"product": "http", "vendor": "reactphp", "versions": [{"status": "affected", "version": ">= 0.6.0, < 1.11.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-84997", "lastModified": "2026-09-30T17:43:24.057", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-84997", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-16T14:46:36.400582Z", "version": "2.0.3"}}]}, "published": "2026-09-16T15:18:00.863", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/reactphp/http/commit/b6d4688790adf3797071fcf88a3fc4225f30486a"}, {"source": "security-advisories@github.com", "url": "https://github.com/reactphp/http/releases/tag/v1.11.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/reactphp/http/security/advisories/GHSA-x424-64qh-5j54"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.6.0,1.11.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "http", "source": "cna", "vendor": "reactphp"}, "product": "http", "vendor": "reactphp"}], "created": "2026-09-17T02:15:08.107065+00:00", "updated": "2026-09-18T03:15:02.168005+00:00", "vendors": ["reactphp", "reactphp$PRODUCT$http"]}