CVE-2026-12606 in Eclipse Grizzly
Eclipse Grizzly in versions before 5.0.2, cannot properly parse the trailer section in malformed trailer header's line, which can be leveraged to perform HTTP request smuggling.
Quick answer
Eclipse Foundation Eclipse Grizzly should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Eclipse Grizzly before 5.0.2
Fixed versions
- Eclipse Grizzly 5.0.2 or later
How to fix it
CVE-2026-12606 affects Eclipse Grizzly. In simple terms, crafted HTTP requests may confuse the server or a proxy. Fix it by updating to Eclipse Grizzly 5.0.2 or later. If this system is online or used by admins, treat the fix as important.
- Find every place where Eclipse Grizzly is installed or used.
- Check if the version matches: Eclipse Grizzly before 5.0.2.
- Update or apply the vendor fix: Eclipse Grizzly 5.0.2 or later.
- If you cannot update today, allow only trusted users and trusted networks.
- Turn off the affected feature or plugin if the vendor says that is safe to do.
- Check logs for crashes, strange requests, new admin actions, or unexpected access.
- Change secrets or passwords if you think data or admin access may have been exposed.
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Verify the fix
- Confirm the installed version or mitigation matches: Eclipse Grizzly 5.0.2 or later.
- Confirm the affected feature is no longer exposed to untrusted users.
- Run the affected workflow again and make sure it still works.
- Review logs again after the fix for repeated suspicious activity.
- Run a new Fixnx scan if this software is part of a public website.
- Save the advisory link and proof of the fix in your change record.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-12606?
Eclipse Foundation Eclipse Grizzly versions listed as affected should be reviewed: Eclipse Grizzly before 5.0.2.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.