# CVE-2026-84851

## Summary

- **CVE ID:** CVE-2026-84851
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-674
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 3, 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.

## Affected Products

- Amazon — ion-c (0)

## References

- [CNA](https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6)
- [CNA](https://aws.amazon.com/security/security-bulletins/2026-094-aws/)
- [CNA](https://github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.34%
- **EPSS Percentile:** 26.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._