Vulnerability · Published Aug 30, 2026 · Assigned by EEF
CVE-2026-81633Unhandled KeyError in AshGraphql relay node resolution crashes queries via an unknown type segment
Medium 6.9
In plain English
A medium-severity improper input validation in ash_graphql from ash-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Official description
Improper Input Validation vulnerability in ash-project ash_graphql allows an unauthenticated client to crash a relay node(id: ...) query with an unhandled KeyError. AshGraphql.Graphql.Resolver.resolve_node/2 decodes the client-supplied global ID with decode_relay_id/1, which only base64-decodes the string and splits it on : without validating the type segment. The decoded type is passed straight to Map.fetch!(type_to_domain_and_resource_map, type). Because fetch! raises on a missing key, a relay ID whose type segment is a valid atom that is not a relay-exposed type aborts the resolver before its resolve/2 clauses and their rescue handlers run, so the error never becomes a GraphQL error and may expose a stacktrace. Common resource names are easy to guess. The fix uses Map.fetch/2 and returns an Invalid node id error for unknown types. This issue affects ash_graphql: from 0.27.0 before 1.11.0.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ash-project | ash_graphql | 0.27.0 – before 1.11.0 |
| ash-project | ash_graphql | 365b3aedc6b36f020e6a2c7dce63fa569243bc4e – before c8863ed8e5c21f1bfb6125f1d24e78443dfc6351 |
Weakness: CWE-20 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/ash-project/ash_graphql/security/advisories/GHSA-mrgv-g7gf-r96h vendor-advisory, related
- https://cna.erlef.org/cves/CVE-2026-81633.html related
- https://osv.dev/vulnerability/EEF-CVE-2026-81633 related
- https://github.com/ash-project/ash_graphql/commit/c8863ed8e5c21f1bfb6125f1d24e78443dfc6351 patch