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PyPi: H11

CVE-2025-43859

Safety vulnerability ID: 76903

This vulnerability was reviewed by experts

The information on this page was manually curated by our Cybersecurity Intelligence Team.

Created at Apr 24, 2025 Updated at Sep 20, 2025
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Advisory

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Affected package

h11

Latest version: 0.16.0

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

Affected versions

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Fixed versions

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Vulnerability changelog

This vulnerability has no description

Resources

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Severity Details

CVSS Base Score

CRITICAL 9.1

CVSS v3 Details

CRITICAL 9.1
Attack Vector (AV)
NETWORK
Attack Complexity (AC)
LOW
Privileges Required (PR)
NONE
User Interaction (UI)
NONE
Scope (S)
UNCHANGED
Confidentiality Impact (C)
HIGH
Integrity Impact (I)
HIGH
Availability Availability (A)
NONE