CVE-2026-84851

Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6

State: Published
Severity: 8.7 High
Published: Sep 2, 2026
Updated: Sep 3, 2026
Reserved: Sep 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	AMZN
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	AMZN

Weaknesses

CWE-674 Uncontrolled Recursion

Affected Products

Product	Versions
ion-cAmazon	before 1.1.6Affected

References

https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-094-aws/vendor-advisory
https://github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44release-notes

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