CVE-2019-16869: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 8.4% chance of exploitation in the next 30 days.

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 products

• Canonical Ubuntu Linux: version 18.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Netty Netty: before 4.1.42 (fixed in 4.1.42)
• Red Hat JBoss Enterprise Application Platform: version 7.2 only; version 7.3 only; version 7.4 only

Published 2019-09-26. Last modified 2026-10-08.