CVE-2026-12606: Eclipse Grizzly

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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".

Affected products

• Eclipse Grizzly: from 4.0.0, up to and including 4.0.2; from 5.0.0, before 5.0.2 (fixed in 5.0.2)

Published 2026-07-14. Last modified 2026-07-27.