All vulnerabilities
CVE-2026-104020GHSA-93q6-f8hx-vv7f

ion-python: Uncontrolled recursion in the Ion reader in Amazon Ion Python

Amazon ion-pythonRuntimes & languages
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.44%Chance of exploitation activity in the next 30 days, higher than 37% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.15.0Fixed versionCVE List
Published1 Oct 2026Updated 9 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 1

  • ion-pythonaffected: all versions before 0.15.0CVE List

References 3