CVE-2026-93574

A flaw was found in Netty's `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.

  • Published Sep 18, 2026
  • CVSS 6.5 medium
  • 1.4% chance of exploitation in the next 30 days (EPSS)
  • A fix is available

Affected software

CVE-2026-93574 at the National Vulnerability Database