CVE-2026-81633
Unhandled KeyError in AshGraphql relay node resolution crashes queries via an unknown type segment
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 30, 2026
- Updated
- Aug 31, 2026
- Reserved
- Aug 30, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | EEF |
Weaknesses
- CWE-20 Improper Input Validation
Affected Products
| Product | Versions |
|---|---|
ash_graphqlash-project |
|
ash_graphqlash-project |
|
References
- https://github.com/ash-project/ash_graphql/security/advisories/GHSA-mrgv-g7gf-r96hvendor-advisoryrelated
- https://cna.erlef.org/cves/CVE-2026-81633.htmlrelated
- https://osv.dev/vulnerability/EEF-CVE-2026-81633related
- https://github.com/ash-project/ash_graphql/commit/c8863ed8e5c21f1bfb6125f1d24e78443dfc6351patch
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