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CVE-2026-104020— Uncontrolled recursion in the Ion reader in Amazon Ion Python

Quick assessment

Affected
Amazon ion-python
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon Ion Python 在 0.15.0 版本之前的 Ion 阅读器中存在无界递归问题。远程未认证攻击者可以通过构造深层嵌套的 Ion 值，导致使用该库的应用程序崩溃，从而引发拒绝服务（Denial of Service, DoS）漏洞。 为缓解此问题，建议用户将 Amazon Ion Python 升级至 0.15.0 或更高版本。

CVSS 7.5 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
Amazon ion-python < 0.15.0 affected
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I. Basic Information for CVE-2026-104020

Vulnerability Information
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Vulnerability Title
Uncontrolled recursion in the Ion reader in Amazon Ion Python
Source: CVE Program / CVE List V5
Vulnerability 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. To remediate this issue, users should upgrade to version 0.15.0 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Amazon ion-python 0 ~ 0.15.0 -

II. Public POCs for CVE-2026-104020

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-104020

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Vendor Advisories for CVE-2026-104020 (2)

Vendor Pages for CVE-2026-104020 (1)

IV. Related Vulnerabilities

Same vendor: Amazon
Same weakness: CWE-674

V. Comments for CVE-2026-104020

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