CVE-2026-78693

Summary

Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_graphql allows a remote client to read internal field names that an application configured its error_handler to redact.

In AshGraphql.Errors, each error is passed to the configured error_handler and the returned map is merged with the pre-handler path via Map.put_new(handled, :path, path). Because put_new defers to the handler only when the handler itself set :path, a sanitizing handler that returns a fresh map or deletes :path has that decision reverted. The re-injected path comes from build_error_path/5, which falls back to raw internal Ash attribute and argument names when no field_names mapping is configured. A validation failure on a non-exposed or nested field therefore returns internal names in the GraphQL error path, defeating the application's redaction.

This issue affects ash_graphql: from 1.9.0 before 1.11.0.

Affected Software

Weaknesses

• CWE-209: CWE-209 Generation of Error Message Containing Sensitive Information

References

• https://github.com/ash-project/ash_graphql/security/advisories/GHSA-ppr2-g9h8-w7qp
• https://cna.erlef.org/cves/CVE-2026-78693.html
• https://osv.dev/vulnerability/EEF-CVE-2026-78693
• https://github.com/ash-project/ash_graphql/commit/78e90d369f09f44c534816de541e60841066a467

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