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CVE-2026-104827

7.5 · HIGH

react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP.

Published Oct 15, 2026CWE-770EPSS 0.52%

Overview

CVE-2026-104827 is a high-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

react/http is an event-driven, streaming HTTP client and server implementation for ReactPHP. From 1.0.0 until 1.11.1, React\Http\Browser uses ClientRequestStream::handleData() to append response-header bytes to an internal buffer without enforcing a size limit. A remote server can send a valid status line and partial header, withhold the \r\n\r\n or \n\n header terminator, and continue streaming data so the buffer grows for the life of the connection. Applications that fetch attacker-controlled or attacker-influenced URLs, including URLs reached through redirects, can exhaust PHP memory_limit and crash the event-loop or worker process. Confidentiality and integrity are unaffected. This issue is fixed in version 1.11.1.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/reactphp/http/commit/2558622d0b76227c60c61eac8a61572cb6638e8cGitHubgithub.com/reactphp/http/releases/tag/v1.11.1GitHubgithub.com/reactphp/http/security/advisories/GHSA-g4f2-2pf3-2pwj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-104827?

CVE-2026-104827 is a high-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-104827?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-104827?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-104827?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-104827 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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