CVE-2026-82749

Summary

Incorrect Authorization vulnerability in ash-project ash widens a relationship's parent(…) scoping filter to match unintended records when the referenced parent field cannot be resolved.

Loading a relationship whose filter references parent(…) resolves that expression against the parent record. resolve_parent_in_filter/3 (lib/ash/actions/read/relationships.ex) resolved an unresolvable parent reference (for example when the referenced field was not selected on the source query) to nil rather than failing. A scoping predicate such as org_id == parent(org_id) then becomes an IS NULL match, and a guard like is_nil(parent(org_id)) or org_id == parent(org_id) activates its unrestricted branch, so the relationship returns records the scope was meant to exclude. The fix fails the read with an error when a parent(…) reference cannot be resolved, instead of defaulting to nil.

This issue affects ash: from 3.13.2 before 3.32.2.

Affected Software

Weaknesses

• CWE-863: CWE-863 Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/ash-project/ash/security/advisories/GHSA-j8fx-ff37-4j9c

References

• https://github.com/ash-project/ash/security/advisories/GHSA-j8fx-ff37-4j9c
• https://cna.erlef.org/cves/CVE-2026-82749.html
• https://osv.dev/vulnerability/EEF-CVE-2026-82749
• https://github.com/ash-project/ash/commit/e52dad2c39a35f6f043f7324d26e4f4e2551dfd2

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