CVE-2026-12606 Other in Eclipse GlassFish
Attackers can perform HTTP request smuggling via malformed trailer headers in Eclipse Grizzly, requiring strict validation settings or an upgrade.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12606?
CVE-2026-12606 is a medium-severity vulnerability in Eclipse GlassFish, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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. Grizzly 5.0.1 supports system properties that enable the behavior that fixes the vulnerability - set org.glassfish.grizzly.http.STRICT_HEADER_NAME_VALIDATION_RFC_9110 and org.glassfish.grizzly.http.STRICT_HEADER_VALUE_VALIDATION_RFC_9110 system properties to "true".
Weakness: CWE-444
Which versions are affected by CVE-2026-12606?
It affects 1 product.
Products include Eclipse Grizzly.
How do I fix CVE-2026-12606?
No fix has been published for CVE-2026-12606 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-12606 being exploited?
There is no known exploitation of CVE-2026-12606 in the wild and no public exploit code.
Sources
Also known as GHSA-c269-4hpf-qfhc, UBUNTU-CVE-2026-12606.