RewindexCVEsAmazon Web Services
CVE-2026-104020: Uncontrolled recursion in the Ion reader in Amazon Ion Python
High · CVSS 7.5 (CVSS 3.1)EPSS 0.44%, 38th percentilePublished Updated Assigner: AMZN
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-674
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Amazon: ion-python
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- aws.amazon.com/security/security-bulletins/2026-122-aws/ (opens in new tab)
- github.com/amazon-ion/ion-python/releases/tag/v0.15.0 (opens in new tab)
- github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)