Re-entrant synchronous publish in AshGraphql subscription batcher delivers one subscriber's records to another's topic
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
Exposure of Data Element to Wrong Session vulnerability in ash-project ash_graphql can deliver one subscription's resolved records to a different subscriber's topic. AshGraphql.Subscription.Batcher.do_send/5 reads the resolved batch from the process dictionary via Process.get(:batch_resolved) and then unconditionally deletes it. That is sound only inside a task the library owns. On the :backpressure_sync and :noproc fallbacks do_send/5 runs inline in the publishing caller's process, so if a resolver inside an outer do_send/5 triggers another synchronous Ash notification, the inner call finds the outer run's value still under :batch_resolved, adopts it as its own result, and publishes it to the inner topic, a different subscription document with a different actor and tenant. It then deletes the key, so the outer run publishes nothing. The key is not namespaced by run, so records cannot be told apart. The fix saves, clears, and restores :batch_resolved around each run. This issue affects ash_graphql: from 1.4.0 before 1.11.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ash-project | ash_graphql | 1.4.0 to before 1.11.0 | 1.11.0 | Patch available | CNA |
- ash_graphql Vendorash-project Affected 1.4.0 to before 1.11.0 Fixed in 1.11.0 Patch available CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:* | — | — | — |
- cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:* Versions — — ·—
Remediation
- Fix · CNA ash_graphql (ash-project) Fixed in 1.11.0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
ash-project ash_graphql 1.11.0
6 records Highest priority Priority HIGH 3 HIGH, 3 MEDIUM
Other records, highest priority first
- TI-2026-56298 Query-complexity limit bypass via first/last pagination arguments in AshGraphql enables denial of servicePriority HIGH 77
- TI-2026-56295 Unhandled KeyError in AshGraphql relay node resolution crashes queries via an unknown type segmentPriority HIGH 70
- TI-2026-54700 Incomplete redaction re-attaches the original error path in AshGraphql, leaking internal field namesPriority HIGH 70
Timeline
- 2026-10-02 Threatist record created from CVE-2026-82367
References
More ash-project vulnerabilities
- TI-2026-56298 Query-complexity limit bypass via first/last pagination arguments in AshGraphql enables denial of service CVSS 4.0HIGH 8.7
- TI-2026-52572 Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter CVSS 4.0HIGH 8.7
- TI-2026-57010 Path traversal in AshAdmin file uploads via unsanitized client filename CVSS 4.0HIGH 8.3
- TI-2026-26840 Ash Framework: Ash.Type.Module.cast_input/2 atom exhaustion via unchecked Module.concat allows BEAM VM crash CVSS 4.0HIGH 8.2
- TI-2026-54252 EEx template evaluation of prompt content in AshAi enables remote code execution CVSS 4.0HIGH 8.9
- TI-2026-54208 Stored XSS in AshAdmin relationship typeahead via unescaped label_field content CVSS 4.0HIGH 8.4
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences