CVE-2026-104020

Description

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.

CVSS Vector

References

• https://aws.amazon.com/security/security-bulletins/2026-122-aws/
• https://github.com/amazon-ion/ion-python/releases/tag/v0.15.0
• https://github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f