CVE-2026-46409 Details
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.
A remote code execution vulnerability has been identified in OpenYak versions prior to 1.1.3. The issue arises because the OpenYak desktop backend exposes an HTTP API to localhost on a random port, commonly 19141. This API lacks server-side origin validation, loopback authentication, and content-type enforcement, while also allowing cross-origin requests from any webpage the user visits. As a result, a malicious page can exploit these weaknesses to execute arbitrary shell commands on the host through the OpenYak build agent, disrupt the service, and exfiltrate personal information and chat history from the user's account, all without any user interaction beyond opening the page.
Users should upgrade to OpenYak version 1.1.3 or later. For those still using version 1.1.2 or earlier, it is recommended to stop using OpenYak until an upgrade can be performed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Aug 7, 2026CISA-ADP
Assessed Aug 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/openyak/openyak/security/advisories/GHSA-ccxp-q2w5-27jw | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
| CWE-346 | Origin Validation Error | [email protected] |
| CWE-352 | Cross-Site Request Forgery (CSRF) | [email protected] |
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
| CWE-942 | Permissive Cross-domain Policy with Untrusted Domains | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| OpenYak | <= 1.1.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 11, 2026 | CVE Modified | CISA-ADP |
| Aug 7, 2026 | New CVE Received | [email protected] |