OpenYak local API: unauthenticated CSRF chain leads to Remote Code Execution (CVE-2026-46409) | HOL Guard CVE

Critical · CVSS 9.6CVE-2026-46409

OpenYak local API: unauthenticated CSRF chain leads to Remote Code Execution

Answer in brief

CVE-2026-46409 records a Critical severity (CVSS 9.6) vulnerability in OpenYak local API: unauthenticated CSRF chain leads to Remote Code Execution. The current sources do not mark it as known exploited. The current feed maps openyak/openyak (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 7, 2026Updated Aug 11, 2026Source checked Sep 22, 2026First seen by HOL Aug 7, 2026Material review Aug 11, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.6. 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 openyak/openyak (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
openyak/openyakgeneric	< 1.1.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for openyak/openyak.
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
Aug 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 7, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

OpenYak is a local-first agent runtime for reliable tool-using models, with a desktop workspace built on top. Prior to version 1.1.3, the OpenYak desktop backend binds an HTTP API to `127.0.0.1:<random port>` (commonly 19141) without server-side Origin validation, loopback authentication, or Content-Type enforcement, and with a wildcard CORS policy. Any webpage a user visits while OpenYak is running can issue cross-origin requests to this local server — the browser acts as a proxy into loopback, bypassing OS-level network isolation. Chained, this lets a malicious page execute arbitrary shell commands on the host (RCE) via the build agent with `permission_presets.bash=true`, shut down the service, and exfiltrate chat history and account PII — with no user interaction beyond opening the page. Version 1.1.3 patches the issue.

Quoted source text, attributed separately from HOL analysis.