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CVE-2026-104020.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 8.7CVSS 4.0 · ff89ba41-3aa1-4d27-914a-91399e9639e5
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSDeferredModified Oct 02, 2026

Disclosure summary

Uncontrolled recursion in the Ion reader in Amazon Ion Python before 0.15.0 might allow a remote unauthenticated actor to crash the application using the library, resulting in a denial of service, via a crafted, deeply nested Ion value. To remediate this issue, users should upgrade to version 0.15.0 or later.

Source-reported weakness categories

CWE-674

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

NIST National Vulnerability Database · NVD-CVE-2026-104020

Open original source · Updated Oct 02, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

Original records & references

PUBLISHED 2026-10-01T17:17:18-04:00
MODIFIED 2026-10-02T15:16:40-04:00
INGESTED 2026-10-06T11:45:14-04:00