CVE-2026-104020
highUncontrolled 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 libra…
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.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (ff89ba41-3aa1-4d27-914a-91399e9639e5)
Timeline (UTC)
Published: 2026-10-01 21:17
Modified: 2026-10-02 19:16
NVD status: Deferred
Last synced 3 days ago
Verified against the source API 2026-10-27 06:56 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://aws.amazon.com/security/security-bulletins/2026-122-aws/ ff89ba41-3aa1-4d27-914a-91399e9639e5
- https://github.com/amazon-ion/ion-python/releases/tag/v0.15.0 ff89ba41-3aa1-4d27-914a-91399e9639e5
- https://github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f ff89ba41-3aa1-4d27-914a-91399e9639e5
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:56 UTC · record ↗