CVE-2026-56149: Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service

mediumCVSS 4.9CVE-2026-56149

CSIRTS triage

vendor: Elastic product: Elasticsearch Denial of service

What: The vulnerability allows for denial of service due to resource allocation without limits.
Who is affected: Deployments of Elasticsearch are affected.
Urgency: Remediation is medium urgency due to the potential for service disruption.
Action: Implement resource limits or upgrade to a patched version when available.

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: medium — CVSS 4.9
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56149

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-2026-561490.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-56149	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

medium[NEW] [medium] Elasticsearch: Multiple vulnerabilities allow denial of servicecert-bund
unknownMultiple vulnerabilities in Elastic products (July 2, 2026)cert-fr-avis
mediumCVE-2026-56149: Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a …nvd

Recent advisories for Allocation of Resources

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-2026-40006: Memory Allocation with Excessive Size Value, Allocation of Resources Without Limits or Throttl…nvd · 2026-07-10
highCVE-2026-31984: A denial-of-service vulnerability caused by unbounded resource allocation was discovered in th…nvd · 2026-07-09
highCVE-2026-56811: Allocation of Resources Without Limits or Throttling vulnerability in phoenixframework phoenix…nvd · 2026-07-07
unknownCVE-2026-56810: Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint (Mint.H…nvd · 2026-07-06
highCVE-2026-54428: Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache Htt…nvd · 2026-07-01
mediumCVE-2026-49090: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to a denial of service v…nvd · 2026-07-01