Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plugin (CVE-2026-18952) | HOL Guard CVE

High · CVSS 8.1CVE-2026-18952

Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plugin

Answer in brief

CVE-2026-18952 records a High severity (CVSS 8.1) vulnerability in Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plugin. The current sources do not mark it as known exploited. The current feed maps AWS/Opensearch (generic), Github/Opensearch (generic), Github/Opensearch (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 12, 2026Updated Aug 21, 2026Source checked Sep 28, 2026First seen by HOL Aug 12, 2026Material review Aug 21, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.1
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AWS/Opensearch (generic), Github/Opensearch (generic), Github/Opensearch (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
AWS/Opensearchgeneric	>=2.15.0 <3.5.0	3.5.0
Github/Opensearchgeneric	>=2.15.0 <3.5.0	3.5.0
Github/Opensearchgeneric	>=2.15.0 <3.7.0	3.7.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for AWS/Opensearch, Github/Opensearch, Github/Opensearch.
Review the reported fix. Update AWS/Opensearch to 3.5.0; Github/Opensearch to 3.5.0; Github/Opensearch to 3.7.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 12, 2026

Sources and claim methodology

Upstream source description

Missing input validation in the threat intelligence feed parser in the OpenSearch Security Analytics plugin might allow an authenticated remote user to perform server-side request forgery and read local files via a crafted URL parameter to the threat intel source configuration endpoint.

Quoted source text, attributed separately from HOL analysis.