CVE-2026-84997

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Source
https://cve.org/CVERecord?id=CVE-2026-84997
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84997.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-84997
Aliases
Published
2026-09-16T14:07:52Z
Modified
2026-09-18T03:48:32Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-835"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84997.json"
}
References

Affected packages

Git / github.com/reactphp/http

Affected ranges

Type
GIT
Repo
https://github.com/reactphp/http
Events
Introduced
b5e7d9bfc9effe8ec723af942c66df042ad17fe6
Fixed
b6d4688790adf3797071fcf88a3fc4225f30486a
Fixed
e5b8eb2654dec6cbbc692a39f05ea4ecd40c8cc1
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0.6.0"
        },
        {
            "fixed": "1.11.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.6.0
v0.7.0
v0.7.1
v0.7.2
v0.7.3
v0.7.4
v0.8.0
v0.8.1
v0.8.2
v0.8.3
v0.8.4
v0.8.5
v0.8.6
v0.8.7
v1.*
v1.0.0
v1.1.0
v1.10.0
v1.11.0
v1.2.0
v1.3.0
v1.4.0
v1.5.0
v1.6.0
v1.7.0
v1.8.0
v1.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84997.json"