Rowboat through 0.9.1 Server-Side Request Forgery via Custom MCP Server (CVE-2026-86122) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-86122

Rowboat through 0.9.1 Server-Side Request Forgery via Custom MCP Server

Answer in brief

CVE-2026-86122 records a Unknown severity vulnerability in Rowboat through 0.9.1 Server-Side Request Forgery via Custom MCP Server. The current sources do not mark it as known exploited. The current feed maps rowboatlabs/rowboat (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 Sep 5, 2026Updated Sep 5, 2026Source checked Sep 6, 2026First seen by HOL Sep 5, 2026Material review Sep 5, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 rowboatlabs/rowboat (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
rowboatlabs/rowboatgeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for rowboatlabs/rowboat.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 5, 2026

Sources and claim methodology

Upstream source description

Rowboat through 0.9.1 fails to validate custom MCP server and webhook URLs, allowing authenticated users to configure arbitrary destinations. Attackers can point these URLs at internal services and cloud metadata endpoints to perform server-side request forgery and enumerate internal network topology.

Quoted source text, attributed separately from HOL analysis.