# CVE-2026-119613: AshAi sends unrecognized tool errors verbatim to MCP clients and the model, disclosing internal details

Status: published. Published: 2026-11-09. Updated: 2026-11-12.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: EEF) — https://github.com/ash-project/ash_ai/commit/af7987769d78ed070c8a9f6e6ee542d91744eae6
- fix: ash_ai (erlang): GitHub reports patched versions 1.5.1. Check the advisory for the affected release branch. (source: GitHub GHSA-vhmw-fwrr-r6c6) — https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6

## Affected products and versions

- ash-project / ash_ai (ash_ai): ≥ 1.5.0; < 1.5.1 (affected, semver). Source: CNA: EEF
- ash-project / ash_ai (ash-project/ash_ai): ≥ fbad04e9620ef70603f4e67e03f15092f58578f6; < af7987769d78ed070c8a9f6e6ee542d91744eae6 (affected, git). Source: CNA: EEF
-  / ash_ai (ash_ai): >= 1.5.0, < 1.5.1 (affected, GitHub advisory range). Source: GitHub GHSA-vhmw-fwrr-r6c6

## Severity and prioritization

- CVSS 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; source: CNA: EEF

- CVSS 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; source: NVD: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

- CISA KEV: No listing in collected sources

- EPSS: 0.27% as of 2026-11-12; percentile 19.14%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-209

## Exploit evidence

- exploit: https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6 (ADP: CISA-ADP)

## References

- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6 (CNA: EEF; vendor-advisory, related)

- https://cna.erlef.org/cves/CVE-2026-119613.html (CNA: EEF; related)

- https://osv.dev/vulnerability/EEF-CVE-2026-119613 (CNA: EEF; related)

- https://github.com/ash-project/ash_ai/commit/fbad04e9620ef70603f4e67e03f15092f58578f6 (CNA: EEF; related)

- https://github.com/ash-project/ash_ai/commit/af7987769d78ed070c8a9f6e6ee542d91744eae6 (CNA: EEF; patch)

- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6 (ADP: CISA-ADP; exploit)

- https://cna.erlef.org/cves/CVE-2026-119613.html (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)

- https://github.com/ash-project/ash_ai/commit/af7987769d78ed070c8a9f6e6ee542d91744eae6 (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)

- https://github.com/ash-project/ash_ai/commit/fbad04e9620ef70603f4e67e03f15092f58578f6 (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)

- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6 (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)

- https://osv.dev/vulnerability/EEF-CVE-2026-119613 (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)

- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6 (GitHub Security Advisories; advisory)

## Provenance

- CNA: EEF: https://www.cve.org/CVERecord?id=CVE-2026-119613; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-119613; retrieved 2026-11-12; source updated 2026-11-12

- GitHub Security Advisories: https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6; retrieved 2026-11-12; source updated 2026-11-07

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-119613; retrieved 2026-11-12; source updated Not reported

Revision: 1c73936436b57b61c4f0e456aca693d28b5cbedfe60048ab912332e38ae1f0e2

Canonical: https://y2.dev/cve/CVE-2026-119613

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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