CVE-2026-82739

Summary

Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash discloses the stored value of a confirmed field to an actor who fails its confirmation check.

Ash.Resource.Validation.Confirm's atomic implementation (atomic/2 in lib/ash/resource/validation/confirm.ex) built the mismatch error with its value set to the field being confirmed. When the actor supplies only the confirmation argument and not the field itself, value resolves through atomic_ref/2 to the field's current stored value, so the mismatch error echoes that stored value back to the actor. Against a confirmation guarding a sensitive attribute, an actor can submit a deliberately wrong confirmation and read the real value from the returned error. The fix reports the actor-supplied confirmation in the error instead of the stored field value.

This issue affects ash: from 2.17.20 before 3.32.2.

Affected Software

Weaknesses

• CWE-209: CWE-209 Generation of Error Message Containing Sensitive Information

ADP Enrichment

CISA ADP Vulnrichment

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

Additional References

• https://github.com/ash-project/ash/security/advisories/GHSA-66cg-vj5m-8w7v

References

• https://github.com/ash-project/ash/security/advisories/GHSA-66cg-vj5m-8w7v
• https://cna.erlef.org/cves/CVE-2026-82739.html
• https://osv.dev/vulnerability/EEF-CVE-2026-82739
• https://github.com/ash-project/ash/commit/7dfe5f0b1ba4267580ded947dc861351d4dc8e2b

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