CVE-2026-104020

EUVD-2026-91059
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Common Weakness Enumeration
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