CVE-2026-103008

Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted request that causes the server to construct and process a deeply nested data structure with no bound on recursion depth. Elasticsearch contains an uncontrolled recursion weakness in how it builds and serializes geometry values produced by scripted runtime fields. Unlike geometry supplied as text, which is subject to a nesting-depth limit, geometry constructed from a script's output is not bounded. An authenticated user with read access to a single index can submit a request defining such a field with a script that produces a deeply nested structure. Processing this request recurses past the available stack space, causing the affected node to terminate. The node does not recover automatically on all deployments and may require manual intervention to restore service.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-198/390872	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:elastic:elasticsearch::::::::
	cpe:2.3:a:elastic:elasticsearch::::::::
	cpe:2.3:a:elastic:elasticsearch::::::::

History

09 Oct 2026, 13:21

Type	Values Removed	Values Added
CPE		cpe:2.3:a:elastic:elasticsearch::::::::
First Time		Elastic elasticsearch Elastic
References	~~() https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-198/390872 -~~	() https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-198/390872 - Vendor Advisory

06 Oct 2026, 20:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-06 20:17

Updated : 2026-10-09 13:21

NVD link : CVE-2026-103008

Mitre link : CVE-2026-103008

CVE.ORG link : CVE-2026-103008

JSON object : View

Products Affected

elastic

elasticsearch

CWE

CWE-674

Uncontrolled Recursion

{"id": "CVE-2026-103008", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-103008", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-06T19:52:26.398877Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@elastic.co", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@elastic.co", "affectedData": [{"vendor": "Elastic", "product": "Elasticsearch", "versions": [{"status": "affected", "version": "8.12.0", "versionType": "semver", "lessThanOrEqual": "8.19.22"}, {"status": "affected", "version": "9.0.0", "versionType": "semver", "lessThanOrEqual": "9.4.7"}, {"status": "affected", "version": "9.5.0", "versionType": "semver", "lessThanOrEqual": "9.5.4"}], "defaultStatus": "unaffected"}]}], "published": "2026-10-06T20:17:14.120", "references": [{"url": "https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-198/390872", "tags": ["Vendor Advisory"], "source": "security@elastic.co"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@elastic.co", "description": [{"lang": "en", "value": "CWE-674"}]}], "descriptions": [{"lang": "en", "value": "Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted request that causes the server to construct and process a deeply nested data structure with no bound on recursion depth. Elasticsearch contains an uncontrolled recursion weakness in how it builds and serializes geometry values produced by scripted runtime fields. Unlike geometry supplied as text, which is subject to a nesting-depth limit, geometry constructed from a script's output is not bounded. An authenticated user with read access to a single index can submit a request defining such a field with a script that produces a deeply nested structure. Processing this request recurses past the available stack space, causing the affected node to terminate. The node does not recover automatically on all deployments and may require manual intervention to restore service."}], "lastModified": "2026-10-09T13:21:34.313", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0571850-1B8D-4572-B6D4-007EB47B595E", "versionEndExcluding": "8.19.23", "versionStartIncluding": "8.12.0"}, {"criteria": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "981FC4D9-6123-4976-859C-26932511601B", "versionEndExcluding": "9.4.8", "versionStartIncluding": "9.0.0"}, {"criteria": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "50BF1B31-EF32-4797-8095-EFD00A168D47", "versionEndExcluding": "9.5.5", "versionStartIncluding": "9.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@elastic.co"}