Description
Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to denial of service via a specially crafted input value that is processed by an affected phonetic encoder of the analysis-phonetic plugin. An authenticated user with permission to write documents to or run searches against an index that uses an affected encoder can cause an Elasticsearch node to exhaust its heap memory. The node can become unresponsive or terminate.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Elastic | Elasticsearch | 8.0.0 – ≤ 8.19.23, 9.0.0 – ≤ 9.4.8, 9.5.0 – ≤ 9.5.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | rubygem-elasticsearch | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | ruby3.3-elasticsearch +2 | No fix yet | — |
Advisories 1
- WID-SEC-2026-4325 Elasticsearch: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026