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CVE-2026-84379

5.3 · MEDIUM

HTTPX2 is a next generation HTTP client for Python.

Published Sep 2, 2026CWE-93EPSS 0.32%

Overview

CVE-2026-84379 is a medium-severity vulnerability. It was published on September 2, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0.

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/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600dGitHubgithub.com/pydantic/httpx2/pull/1142GitHubgithub.com/pydantic/httpx2/releases/tag/v2.11.0GitHubgithub.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6GitHubgithub.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-84379?

CVE-2026-84379 is a medium-severity vulnerability. It was published on September 2, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-84379?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-84379?

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-2026-84379?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-84379 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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