---
cve: "CVE-2026-81636"
severity: "HIGH"
cvss: 8.7
epss: "21.8%"
vendor: "ash-project"
kev: false
exploited: false
published: "2026-08-30 19:17:29"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T16:49:12+02:00"
---

# CVE-2026-81636

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_graphql allows an unauthenticated client to bypass the configured GraphQL query-complexity limit and force an unbounded database read.

AshGraphql.Graphql.Resolver.query_complexity/3 multiplies child complexity by the requested page size only when the argument map contains :limit (offset pagination). Relay connections and keyset pagination use first and last, which never match that clause and fall through to the catch-all that returns child_complexity + 1. A nested relay query such as posts(first: 500) { edges { node { comments(first: 500) { ... } } } } therefore scores as trivially cheap while materializing the full fan-out, passing an Absinthe max_complexity cap that rejects the equivalent limit-based query. The fix adds first and last clauses clamped to the action's page size.

This issue affects ash_graphql: from 0.16.23 before 1.11.0.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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)
- c3229f6a65cbabb32fd7ffcac881922d1b3b30ad (Commit)

## Referenzen

- <https://github.com/ash-project/ash_graphql/security/advisories/GHSA-mwc4-r9fc-h6mg>
- <https://cna.erlef.org/cves/CVE-2026-81636.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-81636>
- <https://github.com/ash-project/ash_graphql/commit/c3229f6a65cbabb32fd7ffcac881922d1b3b30ad>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-81636) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_