CVE-2026-83497Network attack vector

Authenticated code execution via cursor deserialization

Published Aug 31, 2026 · Updated Sep 1, 2026

Deserialization in OpenSearch SQL cursor pagination allows remote authenticated users to execute server code through a crafted cursor parameter. PlanSerializer, DefaultExpressionSerializer, and RelJsonSerializer deserialize cursor-carried Java objects without an ObjectInputFilter allowlist. OpenSearch 2.8 through 3.6 and Amazon OpenSearch Service 2.9 through 3.5 are affected; basic read/search permissions are sufficient.

CVSS severity8.7
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in OpenSearch SQL cursor pagination allows remote authenticated users to execute server code through a crafted cursor parameter. PlanSerializer, DefaultExpressionSerializer, and RelJsonSerializer deserialize cursor-carried Java objects without an ObjectInputFilter allowlist. OpenSearch 2.8 through 3.6 and Amazon OpenSearch Service 2.9 through 3.5 are affected; basic read/search permissions are sufficient.

The record

CVE
CVE-2026-83497
Published
Aug 31, 2026
Updated
Sep 1, 2026
Vendor
OpenSearch Software Foundation
Product
OpenSearch
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 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=2.8 <=3.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenSearch Software Foundation · OpenSearchversion=2.8 <=3.6
Amazon Web Services · Amazon OpenSearch Serviceversion=2.9 <=3.5

Published CVSS scores

8.7AmazonCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8AmazonCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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