Quick answers
- Is CVE-2026-12606 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-12606 being exploited in the wild.
- How severe is CVE-2026-12606?
- Informational severity, with a CVSS score of 6.3, published 14 July 2026.
- Which products and versions are affected?
- Eclipse Foundation GlassFish 4.0.0 to 4.0.2, 5.0.0 to 5.0.1; Eclipse Foundation Grizzly 4.0.0 to 4.0.2, 5.0.0 to 5.0.1.
- Is there a fix for CVE-2026-12606?
- 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-2026-12606 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-12606?
- Check whether you run Eclipse Foundation GlassFish or Eclipse Foundation Grizzly 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
A vulnerability exists in Eclipse Grizzly (and by extension Eclipse GlassFish) due to improper parsing of the HTTP trailer section. Specifically, the framework fails to correctly handle malformed lines within the trailer header, leading to an inconsistent interpretation of HTTP requests between front-end proxies and the back-end Grizzly server (CWE-444). A remote, unauthenticated attacker can exploit this by sending specially crafted HTTP requests to perform request smuggling. This can result in security bypasses or unauthorized request execution. The issue is resolved in version 5.0.2.
Affected products
- Eclipse Foundation Grizzly 4.0.0 to 4.0.2, 5.0.0 to 5.0.1
- Eclipse Foundation GlassFish 4.0.0 to 4.0.2, 5.0.0 to 5.0.1
Timeline
- 2026-07-14: advisory
- 2026-07-14: disclosed