CVE-2026-2587
Critical RCE in Glassfish gadget handler via unsanitized server-side EL in XML.
Is CVE-2026-2587 being exploited?
Not confirmed. CVE-2026-2587 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.65% probability of exploitation in the next 30 days.
How severe is CVE-2026-2587?
CVE-2026-2587 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-2587?
Not known from our data. No patch reference has been recorded for CVE-2026-2587, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-2587 affect?
CVE-2026-2587 affects Glassfish gadget handler, XML processing EL evaluation component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-2587?
Patch when available; restrict EL processing and enforce least privilege.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can execute arbitrary commands, read/modify data, and maintain persistence via unsanitized EL evaluation in XML.
Immediate action required
- affected>= 5.1.0 and <= 6.2.5
- affected>= 7.0.0 and < 7.0.26
- affected>= 7.1.0 and < 7.1.1
- affected>= 8.0.0 and < 8.0.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.