CVE-2026-104020
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.
- Published Oct 1, 2026
- CVSS 8.7 high
- 0.4% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
In the news
- CVE-2026-104020 - Uncontrolled recursion in the Ion reader in Amazon Ion Python AWS Security Bulletins ·