CVE-2026-72649: Deserialization of Untrusted Data in Elasticsearch Leading to Remote Code Execution

highCVSS 8.8CVE-2026-72649

CSIRTS triage

vendor: Elasticsearch product: Elasticsearch Unsafe deserialization Remote code execution

What: Deserialization of untrusted data in Elasticsearch allows remote code execution.
Who is affected: All deployments of Elasticsearch accepting untrusted serialized input, particularly those exposed to the network.
Urgency: Critical; CVSS 8.8 and direct RCE path warrant immediate patching.
Action: Apply Elasticsearch security patch immediately; restrict network access to Elasticsearch nodes pending patch deployment.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.8
Published: 2026-09-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72649

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-726490.57% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 45% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-72649	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Elasticsearch: Multiple Vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Elastic products (02 September 2026)cert-fr-avis
highCVE-2026-72649: Deserialization of Untrusted Data (CWE-502) in the Elasticsearch machine learning component ca…nvd

Recent advisories for Deserialization of Untrusted

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-72649: Deserialization of Untrusted Data (CWE-502) in the Elasticsearch machine learning component ca…nvd · 2026-09-01
highCVE-2026-61779: NVIDIA Megatron Bridge contains a vulnerability where an attacker could cause a deserializatio…nvd · 2026-09-01
highCVE-2026-61778: NVIDIA Megatron Bridge contains a vulnerability where an attacker could cause a deserializatio…nvd · 2026-09-01
highCVE-2026-61777: NVIDIA Megatron Bridge contains a vulnerability where an attacker could cause a deserializatio…nvd · 2026-09-01
highCVE-2026-61776: NVIDIA Megatron Bridge contains a vulnerability where an attacker could cause a deserializatio…nvd · 2026-09-01
highCVE-2026-61775: NVIDIA Megatron Bridge contains a vulnerability where an attacker could cause a deserializatio…nvd · 2026-09-01