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  4. CVE 2026 104020 uncontrolled recursion in the ion reader in
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Back to active CVEs
High · CVSS 8.7CVE-2026-104020

Uncontrolled recursion in the Ion reader in Amazon Ion Python

Answer in brief

CVE-2026-104020 records a High severity (CVSS 8.7) vulnerability in Uncontrolled recursion in the Ion reader in Amazon Ion Python. The current sources do not mark it as known exploited. The current feed maps Amazon/ion-python (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 2, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Amazon/ion-python (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Amazon/ion-pythongeneric>=0 <0.15.00.15.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Amazon/ion-python.
  2. 2Review the reported fix. Update Amazon/ion-python to 0.15.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 1, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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  • Joyland AI hard-coded credentials for push notificationsSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-674
Source
CVE List V5
Source checked
Oct 2, 2026
References
3 linked sources
Open source record