{"id":"CVE-2026-104020","aliases":["EUVD-2026-91059","GHSA-93q6-f8hx-vv7f"],"status":"published","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.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00441,"percentile":0.38785,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-674"],"published":"2026-10-01T20:36:33Z","modified":"2026-10-28T02:30:24Z","products":[{"vendor":"amazon","product":"ion-python"}],"references":[{"url":"https://github.com/amazon-ion/ion-python/releases/tag/v0.15.0","tags":["patch","fix"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-122-aws/","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104020.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104020","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-104020","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.","status":"published","published":"2026-10-01T20:36:33.967Z","modified":"2026-10-09T16:36:02.469Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:20:09.448255Z"}],"euvd":[{"id":"EUVD-2026-91059","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.","status":"published","published":"2026-10-01T20:36:33Z","modified":"2026-10-09T16:36:02Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T17:27:25.010362Z"}],"nvd":[{"id":"CVE-2026-104020","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.","status":"published","published":"2026-10-01T21:17:18.65Z","modified":"2026-10-02T19:16:40.303Z","cvss":[{"version":"4.0","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:12:53.41762Z"}],"osv":[{"id":"CVE-2026-104020","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.","status":"published","published":"2026-10-01T20:36:33.967Z","modified":"2026-10-28T02:30:24.995387012Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T15:44:54.236592Z"}]}}