CVE-2026-84851

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductAmazon Ion-c

PublishedSep 3, 2026

First seenSep 3, 2026

Weakness typeCWE-674CWE-674

How to fix

Update

Amazon ion-c1.1.6 or later

Patches

github.com/amazon-ion/ion-c/releases/tag/v1.1.6

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-094-aws/
github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44

Affected products

Product	Affected versions	Fixed in
Amazon ion-c	v < 1.1.6	1.1.6

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