{"id":"CVE-2026-104020","revision":"9d238a3ecc2f4ebe94bc5de94e085626","records":[{"revision":"9d238a3ecc2f4ebe94bc5de94e085626","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-104020","aliases":[],"title":"Uncontrolled recursion in the Ion reader in Amazon Ion Python","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.\n\n\n\nTo remediate this issue, users should upgrade to version 0.15.0 or later.","state":0,"publishedAt":"2026-10-01T20:36:33.967+00:00","modifiedAt":"2026-10-09T16:36:02.469+00:00","affected":[{"ecosystem":"Vendor product","name":"ion-python","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Amazon\",\n                    \"product\": \"ion-python\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"0.15.0\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"}],"references":["https://github.com/amazon-ion/ion-python/releases/tag/v0.15.0","https://aws.amazon.com/security/security-bulletins/2026-122-aws/","https://github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-104020","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-104020","identifiers":["CVE-2026-104020"]},"retained":false,"historicalAffected":[]}],"coverage":[]}