h2-4.3.0-py3-none-any.whl: 1 vulnerabilities (highest severity is: 5.3)

[mend-bolt-for-github]

Vulnerable Library - h2-4.3.0-py3-none-any.whl

Pure-Python HTTP/2 protocol implementation

Library home page: https://files.pythonhosted.org/packages/69/b2/119f6e6dcbd96f9069ce9a2665e0146588dc9f88f29549711853645e736a/h2-4.3.0-py3-none-any.whl

Sample Path to Dependency File: /ai/requirements.txt

Path to vulnerable library: /tmp/ws-ua_20260331025725_MIUFBE/python_UVEQHS/20260331025831/16/h2-4.3.0-py3-none-any.whl

Vulnerabilities

Vulnerability	Severity	CVSS	Dependency	Type	Fixed in (h2 version)	Remediation Possible**
CVE-2026-71554	Medium	5.3	h2-4.3.0-py3-none-any.whl	Direct	4.4.1	❌

**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation

Details

CVE-2026-71554

Vulnerable Library - h2-4.3.0-py3-none-any.whl

Pure-Python HTTP/2 protocol implementation

Library home page: https://files.pythonhosted.org/packages/69/b2/119f6e6dcbd96f9069ce9a2665e0146588dc9f88f29549711853645e736a/h2-4.3.0-py3-none-any.whl

Sample Path to Dependency File: /ai/requirements.txt

Path to vulnerable library: /tmp/ws-ua_20260331025725_MIUFBE/python_UVEQHS/20260331025831/16/h2-4.3.0-py3-none-any.whl

Dependency Hierarchy:

• ❌ h2-4.3.0-py3-none-any.whl (Vulnerable Library)

Found in base branch: main

Vulnerability Details

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request carries two Host header lines, providing a request smuggling primitive. This issue is fixed in version 4.4.1.

Publish Date: 2026-08-06

URL: CVE-2026-71554

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-6hr6-w5qg-qmwg

Release Date: 2026-08-06

Fix Resolution: 4.4.1

Step up your Open Source Security Game with Mend here