CVE-2023-26044Network attack vector

Service slowdown via excessive multipart part parsing

Published May 17, 2023 · Updated Jan 23, 2025

Uncontrolled resource consumption in ReactPHP HTTP before 1.9.0 allows remote attackers to delay request handling with large multipart bodies. MultipartParser continues splitting and parsing parts after max_input_vars and max_file_uploads have already made additional fields unusable. Exploitation requires RequestBodyBufferMiddleware configured with a very large limit and consumes CPU, slowing legitimate requests.

CVSS severity5.3
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in ReactPHP HTTP before 1.9.0 allows remote attackers to delay request handling with large multipart bodies. MultipartParser continues splitting and parsing parts after max_input_vars and max_file_uploads have already made additional fields unusable. Exploitation requires RequestBodyBufferMiddleware configured with a very large limit and consumes CPU, slowing legitimate requests.

The record

CVE
CVE-2023-26044
Published
May 17, 2023
Updated
Jan 23, 2025
Vendor
ReactPHP
Product
ReactPHP HTTP
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.8.0, < 1.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ReactPHP · ReactPHP HTTPversion=>= 0.8.0, < 1.9.0

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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