CVE-2026-81643

Summary

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.

Affected Software

Weaknesses

• CWE-863: CWE-863 Incorrect Authorization

References

• 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

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