{"id":"CVE-2026-104020","summary":"Uncontrolled recursion in the Ion reader in Amazon Ion Python","details":"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.","aliases":["GHSA-93q6-f8hx-vv7f"],"modified":"2026-10-04T02:30:23.734183514Z","published":"2026-10-01T20:36:33.967Z","database_specific":{"cna_assigner":"AMZN","cwe_ids":["CWE-674"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104020.json"},"references":[{"type":"ADVISORY","url":"https://aws.amazon.com/security/security-bulletins/2026-122-aws/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104020.json"},{"type":"ADVISORY","url":"https://github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104020"},{"type":"FIX","url":"https://github.com/amazon-ion/ion-python/releases/tag/v0.15.0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/amazon-ion/ion-python","events":[{"introduced":"0"},{"fixed":"46555409cb3fd02f8bb00dee9f8baf610155e9f6"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.15.0"}],"source":["AFFECTED_FIELD","DESCRIPTION","REFERENCES"]}}],"versions":["v0.14.6","v0.14.5","v0.14.4","v0.14.3","v0.14.2","v0.14.1","v0.14.0","v0.13.0","v0.12.0","v0.11.3","v0.11.2","v0.11.1","v0.10.0","v0.9.3","v0.9.2","v0.9.1","v0.9.0","v0.8.0","v0.7.0","v0.6.0","v0.5.0","v0.4.1","v0.4.0","v0.3.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104020.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}