h11-0.14.0-py3-none-any.whl: 1 vulnerabilities (highest severity is: 9.1)

[mend-bolt-for-github[bot]]

Vulnerable Library - h11-0.14.0-py3-none-any.whl

A pure-Python, bring-your-own-I/O implementation of HTTP/1.1

Library home page: https://files.pythonhosted.org/packages/95/04/ff642e65ad6b90db43e668d70ffb6736436c7ce41fcc549f4e9472234127/h11-0.14.0-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Vulnerabilities

CVE	Severity	CVSS	Dependency	Type	Fixed in (h11 version)	Remediation Possible**
CVE-2025-43859	Critical	9.1	h11-0.14.0-py3-none-any.whl	Direct	h11 - 0.16.0	❌

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

Details

CVE-2025-43859

Vulnerable Library - h11-0.14.0-py3-none-any.whl

A pure-Python, bring-your-own-I/O implementation of HTTP/1.1

Library home page: https://files.pythonhosted.org/packages/95/04/ff642e65ad6b90db43e668d70ffb6736436c7ce41fcc549f4e9472234127/h11-0.14.0-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• :x: h11-0.14.0-py3-none-any.whl (Vulnerable Library)

Found in base branch: main

Vulnerability Details

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

Publish Date: 2025-04-24

URL: CVE-2025-43859

CVSS 3 Score Details (9.1)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/advisories/GHSA-vqfr-h8mv-ghfj

Release Date: 2025-04-24

Fix Resolution: h11 - 0.16.0

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