---
cve: "CVE-2026-81633"
severity: "MEDIUM"
cvss: 6.9
epss: "5.3%"
vendor: "ash-project"
kev: false
exploited: false
published: "2026-08-30 19:17:29"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T07:09:48+02:00"
---

# CVE-2026-81633

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 4e2c5476ecfd2c701488627ee46e6eefc58c982e (Commit)
- c8863ed8e5c21f1bfb6125f1d24e78443dfc6351 (Commit)

## Referenzen

- <https://github.com/ash-project/ash_graphql/security/advisories/GHSA-mrgv-g7gf-r96h>
- <https://cna.erlef.org/cves/CVE-2026-81633.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-81633>
- <https://github.com/ash-project/ash_graphql/commit/c8863ed8e5c21f1bfb6125f1d24e78443dfc6351>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-81633) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_