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

Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a denial of service via Excessive Allocation (CAPEC-130). A user with elevated privileges can submit a specially crafted machine learning request that causes excessive memory consumption, which may render the affected node unavailable.

Published: 2026-07-01 Last update: 2026-07-02 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-56149 is rated Low Risk (28.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.32%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-56149

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-02 — 0.32% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-56149

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.2 3.6 [email protected]

Weakness enumeration for CVE-2026-56149

GitHub Security Advisory for CVE-2026-56149

GHSA-p6pw-6f2m-xxpg · Severity: medium — Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a...

OS Trackers for CVE-2026-56149

vendor priority summary link
ubuntu medium CVE-2026-56149 medium priority: Ubuntu including 1 source packages (elasticsearch), 5 status rows across 5 suites (jammy, noble, questing, resolute, upstream): DNE 4, needs-triage 1. https://ubuntu.com/security/CVE-2026-56149

Affected software / configurations for CVE-2026-56149

Vendor Product Version Raw CPE
elastic elasticsearch >= 8.0.0, < 8.19.17 cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*
elastic elasticsearch >= 9.0.0, < 9.3.6 cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*
elastic elasticsearch >= 9.4.0, < 9.4.3 cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*

References for CVE-2026-56149

cvelogic Threat Intelligence