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CVE-2026-84997— react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU

Quick assessment

Affected
reactphp http
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

react/http 是 ReactPHP 的一个事件驱动、流式 HTTP 客户端和服务器实现。从 0.6.0 版本到 1.11.1 版本，React\Http\Io\ChunkedDecoder 在处理格式错误的 Transfer-Encoding: chunked 响应体时，可能陷入无限循环。这是因为 handleData 方法要求缓冲区在每次迭代中都必须缩小。当遇到一个不包含 CRLF 的未完成终端块（terminal-chunk）拖尾部分时，strpos 函数返回 false，导致缓冲区在处理后保持不变；此

CVSS 7.5 · High EPSS 0.55% · P45

Affected Version Matrix 1

VendorProduct Version RangeStatus
reactphp http >= 0.6.0, < 1.11.1 affected
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I. Basic Information for CVE-2026-84997

Vulnerability Information
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Vulnerability Title
react/http: A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
reactphp http >= 0.6.0, < 1.11.1 -

II. Public POCs for CVE-2026-84997

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III. Intelligence Information for CVE-2026-84997

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Patches & Fixes for CVE-2026-84997 (1)

Vendor Advisories for CVE-2026-84997 (1)

Vendor Pages for CVE-2026-84997 (1)

IV. Related Vulnerabilities

Same product: http
Same vendor: reactphp
Same weakness: CWE-835

V. Comments for CVE-2026-84997

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