Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Elasticsearch versions 8.13.1 up to but not including 8.14.0 are affected. When an index template uses a dynamic field mapping of "passthrough" type, ingesting certain documents into that index can trigger a StackOverflow exception, leading to denial of service. The source does not state what access an attacker needs. Upgrade to Elasticsearch 8.14.0 or later; no other workaround is listed.
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 |
|---|---|---|---|---|
| 4.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H | CNA (elastic) |
- CISA KEV Not listed.
- EPSS 0.0062, the 50th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:17 UTC First seen by agentprime
- 31 Oct 2026, 14:17 UTC Confirmed by OSV