High 7.5Published Sep 2, 2026

CVE-2026-84851Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6

Updated under an hour ago (2026-10-19 08:30 UTC)

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It affects Amazon ion-c. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Amazon ion-c

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-674
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Sep 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Amazon ion-c amazon:ion_c (from the name)	before 1.1.6	CNA record

References

https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6release-notes, patch
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.