What’s Vulnerable › Vulnerabilities

CVE-2026-82739: Ash.Resource.Validation.Confirm leaks a confirmed field's stored value in the atomic mismatch error

• Severity: low (CVSS 2.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-01
• Weakness: CWE-209

Description

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 products

• ash-project ash: from 2.17.20 before 3.32.2 — fixed in 3.32.2

How to fix

Upgrade to a fixed version: ash-project ash 3.32.2. Check the vendor advisory for mitigations.

References

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

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