CVE-2026-72686 json
Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
published 2026-08-13 2 mo ago modified 2026-09-08 2 mo ago also BIT-elasticsearch-2026-72686 , EUVD-2026-58250
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 47%
- public exploits
- 0
- none known
Summary
A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single request containing a crafted user-supplied input. A specific internal component validates the input using a recursive routine and applies no bound to the length of the value being validated, so the validation causes the thread to exhaust its stack. The resulting fatal error is not handled by the surrounding execution paths and terminates the affected node process, producing a denial of service.
Patch / fix
- bitnami elasticsearch 8.19.20, 9.4.5, 9.5.1
- elastic elasticsearch 8.19.20, 9.4.5, 9.5.1
- elasticsearch elasticsearch 8.19.20, 9.4.5, 9.5.1
- org.elasticsearch elasticsearch 8.19.20, 9.4.5, 9.5.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | elasticsearch | >=8.0.0, <8.19.20 >=9.0.0, <9.4.5 >=9.5.0, <9.5.1 |
8.19.20 9.4.5 9.5.1 |
Affected products
- Elastic Elasticsearch
Classification
- Weakness
-
- CWE-674 Uncontrolled Recursion
References
Sources
- CVE List CVE-2026-72686
- NVD CVE-2026-72686
- OSV BIT-elasticsearch-2026-72686
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.