Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
GeoServer versions 2.26.0 to before 2.26.3 and versions before 2.25.7 (packages gs-web-app, gs-wms and gs-wps-core) are affected. An attacker who can submit a malicious Jiffle script, through a WMS dynamic style or the WPS Jiffle process, can make GeoServer enter an infinite loop and cause a denial of service. Upgrade to version 2.26.3 or 2.25.7. Where upgrading is not possible, disable WMS dynamic styling and, if the WPS extension is installed, the Jiffle process.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0053, the 45th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:10 UTC First seen by agentprime
- 31 Oct 2026, 15:10 UTC Confirmed by OSV