CVE-2026-119613
AshAi sends unrecognized tool errors verbatim to MCP clients and the model, disclosing internal details
Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_ai allows a caller of an AshAi tool to read internal error details, including module names and data values, by making a tool call fail. AshAi.ToToolError gained an implementation for Ash.Error.Unknown.UnknownError that returns the error's error field as is, and AshAi.Tool.Errors.format/1 sends that text to MCP clients (tool calls and resource reads in AshAi.Mcp.Server) and to the model in AshAi.ToolLoop. Ash stores the full Exception.format/2 output of a raised exception, or inspect/1 of a bare {:error, term} return, in that field. A tool result that cannot be JSON-encoded raises a Protocol.UndefinedError whose text includes the inspected value, which can be a whole record with fields the tool never returns. None of these errors were logged. The fix logs them under an error id and returns only that id to the caller. This issue affects ash_ai: from 1.5.0 before 1.5.1.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: EEFFix
ash_ai (erlang): GitHub reports patched versions 1.5.1. Check the advisory for the affected release branch.
Source: GitHub GHSA-vhmw-fwrr-r6c6Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| ash_ai ash-project ash_ai
hex |
≥ 1.5.0; < 1.5.1 (affected, semver)
Other versions: unaffected |
CNA: EEF |
| ash_ai ash-project ash-project/ash_ai
github |
≥ fbad04e9620ef70603f4e67e03f15092f58578f6; < af7987769d78ed070c8a9f6e6ee542d91744eae6 (affected, git)
Other versions: unaffected |
CNA: EEF |
ash_aiash_ai
erlang |
>= 1.5.0, < 1.5.1 (affected, GitHub advisory range) | GitHub GHSA-vhmw-fwrr-r6c6 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | CNA: EEF |
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db |
Exploit evidence
- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6
exploit · ADP: CISA-ADP
References
- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6CNA: EEF · vendor-advisory, related
- https://cna.erlef.org/cves/CVE-2026-119613.htmlCNA: EEF · related
- https://osv.dev/vulnerability/EEF-CVE-2026-119613CNA: EEF · related
- https://github.com/ash-project/ash_ai/commit/fbad04e9620ef70603f4e67e03f15092f58578f6CNA: EEF · related
- https://github.com/ash-project/ash_ai/commit/af7987769d78ed070c8a9f6e6ee542d91744eae6CNA: EEF · patch
- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6ADP: CISA-ADP · exploit
- https://cna.erlef.org/cves/CVE-2026-119613.html6b3ad84c-e1a6-4bf7-a703-f496b71e49db
- https://github.com/ash-project/ash_ai/commit/af7987769d78ed070c8a9f6e6ee542d91744eae66b3ad84c-e1a6-4bf7-a703-f496b71e49db
- https://github.com/ash-project/ash_ai/commit/fbad04e9620ef70603f4e67e03f15092f58578f66b3ad84c-e1a6-4bf7-a703-f496b71e49db
- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c66b3ad84c-e1a6-4bf7-a703-f496b71e49db
- https://osv.dev/vulnerability/EEF-CVE-2026-1196136b3ad84c-e1a6-4bf7-a703-f496b71e49db
- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6134c704f-9b21-4f2e-91b3-4a467353bcc0
- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6GitHub Security Advisories · advisory
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