Quick answers
- Is CVE-2026-93574 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93574 being exploited in the wild.
- How severe is CVE-2026-93574?
- Medium severity, with a CVSS score of 6.5, published 18 September 2026.
- Which products and versions are affected?
- Netty Project Netty <UNKNOWN>.
- Is there a fix for CVE-2026-93574?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-93574 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-93574?
- Check whether you run Netty Project Netty at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in netty-codec-http's chunk-size token parser, which incorrectly handles post-digit whitespace in HTTP/1.1 chunked transfer encoding headers. This parsing discrepancy enables HTTP request smuggling attacks where an attacker crafts a request that different entities (proxy vs backend) interpret differently. Remote, unauthenticated exploitation is possible over the network.
Affected products
- Netty Project Netty <UNKNOWN>
Timeline
- 2026-09-18: disclosed