{"schema":"threatline.record/2","record":{"id":"CVE-2026-104020","aliases":["GHSA-93q6-f8hx-vv7f"],"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.","categories":["Runtimes & languages"],"product":"ion-python","vendor":"Amazon","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104020","source_modified_at":"2026-10-09T16:36:02.469Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"ion-python","vendor":"Amazon","versions":[{"status":"affected","version":"0","lessThan":"0.15.0","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104020","source_modified_at":"2026-10-09T16:36:02.469Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"ion-python","ecosystem":null},"version":"0.15.0","basis":"first unaffected version stated in the CVE record"}],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00441,"percentile":0.37279,"score_date":"2026-10-23"},"published_at":"2026-10-01T20:36:33.967Z","modified_at":"2026-10-09T16:36:02.469Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-104020","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-09T16:36:02.469Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-104020","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/amazon-ion/ion-python/releases/tag/v0.15.0","tags":["patch"]},{"source":"CVE List","url":"https://aws.amazon.com/security/security-bulletins/2026-122-aws/","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-02T18:27:38.177546Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-09T16:36:02.469Z","content_hash":"d0b9fc8f35a8a232b8cffb6c78bf3fae92dc7f6653ef2130cebb8eefeca0bc89"}}