CVE-2026-77950RPC error handler fails open in AshTypescript, disclosing unredacted errors

Official description

Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_typescript allows an unauthenticated attacker to receive unredacted internal error data by provoking an error shape the configured error handler does not match. apply_error_handler/3 in lib/ash_typescript/rpc/errors.ex is the only hook an application has for redacting or suppressing errors before they reach the client, with a nil return dropping the error entirely. Its rescue clause logs a warning and then returns the original, pre-handler error map. Error handlers are conventionally written as pattern-matching functions over expected error shapes, so an unmatched shape raises FunctionClauseError and the raw transformed error, including any secrets carried in vars, is emitted instead. An intent to suppress an error becomes an intent to publish it. The rescue catches exceptions only, so a handler that throws or exits still propagates. This issue affects ash_typescript: from 0.8.0 before 0.18.0.

Affected products (as reported)

References

• https://github.com/ash-project/ash_typescript/security/advisories/GHSA-mjr7-r3rf-x963 related, vendor-advisory
• https://cna.erlef.org/cves/CVE-2026-77950.html related
• https://osv.dev/vulnerability/EEF-CVE-2026-77950 related
• https://github.com/ash-project/ash_typescript/commit/59d8e985a98cf2e01794dbe5b919b897a95311f4 patch