---
id: CVE-2026-81633
title: >-
  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 …
summary: >-
  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 …
severity: none
cwe:
  - CWE-20
published: '2026-08-30'
updated: '2026-08-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81633'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-81633.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/ash-project/ash_graphql/commit/c8863ed8e5c21f1bfb6125f1d24e78443dfc6351
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/ash-project/ash_graphql/security/advisories/GHSA-mrgv-g7gf-r96h
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-81633'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
tags:
  - nvd
ingestedAt: '2026-08-31T02:00:58.188Z'
epss: 0.00524
epssPercentile: 0.42007
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.