CVE-2026-75897Network attack vectorHinoki check available

Unauthenticated DoS via unbounded request body

Published Aug 18, 2026 · Updated Aug 18, 2026

Denial of service in OpenSearch Dashboards before 3.8.0 allows remote attackers to interrupt service via a crafted HTTP request. The capabilities route handler accepts client-supplied request bodies without enforcing a maximum size before parsing them, so oversized payloads can consume memory and processing resources. No authentication or user interaction is required; exposure depends on network reachability to the Dashboards HTTP interface, including Amazon OpenSearch Service versions 1.3 through 3.5.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in OpenSearch Dashboards before 3.8.0 allows remote attackers to interrupt service via a crafted HTTP request. The capabilities route handler accepts client-supplied request bodies without enforcing a maximum size before parsing them, so oversized payloads can consume memory and processing resources. No authentication or user interaction is required; exposure depends on network reachability to the Dashboards HTTP interface, including Amazon OpenSearch Service versions 1.3 through 3.5.

The record

CVE
CVE-2026-75897
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
OpenSearch Software Foundation
Product
OpenSearch Dashboards
Classifications
CWE-1284, CAPEC-130, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.3 <=3.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSearch Software Foundation · OpenSearch Dashboardsversion=1.3 <=3.7.0
Amazon Web Services · Amazon OpenSearch Serviceversion=1.3 <=3.5

Published CVSS scores

7.5AMZNCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7AMZNCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CAPEC-130Excessive Allocation
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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