Quick answers
- Is CVE-2026-93569 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93569 being exploited in the wild.
- How severe is CVE-2026-93569?
- High severity, with a CVSS score of 8.2, published 18 September 2026.
- Which products and versions are affected?
- Netty Netty.
- Is there a fix for CVE-2026-93569?
- 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-2026-93569 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-93569?
- Check whether you run Netty. 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's HTTP/1 to HTTP/2 protocol conversion logic. When an HTTP/1 request contains both an absolute-form request-target (e.g., in the request line) and a conflicting Host header, Netty incorrectly prioritizes the Host header when constructing the HTTP/2 :authority pseudo-header, discarding the authority from the original request-target. This inconsistency allows attackers to craft requests that bypass host-based security controls in Netty-based proxies or gateways. The flaw is remotely exploitable without authentication. No patch availability information is provided in the advisory.
Affected products
- Netty Netty
Timeline
- 2026-09-18: disclosed