An uncontrolled recursion issue exists in Amazon Ion-C versions before 1.1.6 that might allow a remote unauthenticated actor to craft Ion data that exhausts the native call stack and crashes the application using the library, resulting in a denial of service.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Amazon ion-c unaffected
Version Status Constraints
0 affected < 1.1.6

No data.

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Project Subscriptions

Vendors Products
Amazon Subscribe
Ion-c Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-094-aws/ cve-icon
https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6 cve-icon
https://github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44 cve-icon
History

Wed, 02 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Description An uncontrolled recursion issue exists in Amazon Ion-C versions before 1.1.6 that might allow a remote unauthenticated actor to craft Ion data that exhausts the native call stack and crashes the application using the library, resulting in a denial of service.
Title Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6
First Time appeared Amazon
Amazon ion-c
Weaknesses CWE-674
CPEs cpe:2.3:a:amazon:ion-c:*:*:*:*:*:*:*:*
Vendors & Products Amazon
Amazon ion-c
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-09-02T20:22:33.566Z

Reserved: 2026-09-02T13:01:03.758Z

Link: CVE-2026-84851

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses