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High

HTTP Request Smuggling in Netty

  • Disclosed: 11.10.2019
  • Updated: 11.10.2026 12:22

Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) io.netty:netty >= 3.3.0.Final, <= 4.0.0.Alpha8 no fix
Java / Kotlin (Maven) io.netty:netty-all >= 4.0.0.Beta1, < 4.1.42.Final 4.1.42.Final
Java / Kotlin (Maven) org.jboss.netty:netty <= 3.2.9.Final no fix

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE)
CWE-444
Platform
Java / Kotlin (Maven)
Package
io.netty:netty, io.netty:netty-all, org.jboss.netty:netty
Disclosed
11.10.2019
Updated
11.10.2026 12:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-p979-4mfw-53vg - CC BY 4.0

Vulnerability history: io.netty:netty-all

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries
2
First → latest
10.2019 05.2022
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 1
  • Medium 1

Disclosures per year

  1. Netty denial of service vulnerability
    Medium CVE-2014-0193 >= 4.0.0.Alpha1, < 4.0.19.Final 4.0.19.Final
  2. HTTP Request Smuggling in Netty this entry
    High · 7.5 CVE-2019-16869 >= 4.0.0.Beta1, < 4.1.42.Final 4.1.42.Final

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