---
cve: "CVE-2026-81643"
severity: "LOW"
cvss: 2.3
epss: "2.6%"
vendor: "ash-project"
kev: false
exploited: false
published: "2026-08-30 19:17:29"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T16:49:18+02:00"
---

# CVE-2026-81643

> 2.3 LOW · 🧪 PoC

## Beschreibung

Incorrect Authorization vulnerability in ash-project ash_graphql delivers GraphQL subscription payloads for records a subscriber is not authorized to see.

In AshGraphql.Subscription.Batcher, do_send/5 resolves the first notification of a batch and filters it with should_send?/1, which drops results whose errors are coded forbidden or not_found or carry no code, precisely so that unauthorized results are not disclosed. The remaining notifications in the batch are read from the process dictionary, re-run through the pipeline, and appended to the outgoing results without that filter. They reach pubsub.publish_subscription/2, and the not is_nil(record) guard drops only nil records, not error-carrying results. Any two qualifying notifications arriving within the default one-second batch interval suffice, and batching is the default path. The fix applies should_send?/1 to the whole batch.

This issue affects ash_graphql: from 1.4.0 before 1.11.0.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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 | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 4e2c5476ecfd2c701488627ee46e6eefc58c982e (Commit)
- e8e67f39add2ce0771e6db5f086afe68ba212c57 (Commit)

## Referenzen

- <https://github.com/ash-project/ash_graphql/security/advisories/GHSA-j684-hch4-q888>
- <https://cna.erlef.org/cves/CVE-2026-81643.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-81643>
- <https://github.com/ash-project/ash_graphql/commit/e8e67f39add2ce0771e6db5f086afe68ba212c57>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-81643) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_