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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

h11 accepts some malformed Chunked-Encoding bodies

Fix availableCritical · CVSS 9.1EPSS 0.59%

Published Apr 24, 2025 · updated Oct 27, 2026

What to do

  1. Upgrade to a fixed version: h11 0.16.0.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIh11212,626,196 downloads/week

Vulnerable versions
< 0.16.0
Fixed in
0.16.0

Check your project: pip show h11

Sources

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

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