Ash.Type.Module.cast_input/2 atom exhaustion via unchecked Module.concat allows BEAM VM crash

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0044, the 38th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:25 UTC First seen by agentprime
2. 31 Oct 2026, 15:25 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-jjf9-w5vj-r6vp
• OSV: GHSA-jjf9-w5vj-r6vp
• github.com/ash-project/ash/security/advisories/GHSA-jjf9-w5vj-r6vp
• nvd.nist.gov/vuln/detail/CVE-2026-34593
• github.com/ash-project/ash/commit/7031103da38cd1366cec8c96d6bcdc9b989aa3c2
• github.com/ash-project/ash
• github.com/ash-project/ash/releases/tag/v3.22.0

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.