High severity · published Sep 2, 2026
CVE-2026-84851
Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IO
ion-c · Amazon
before 1.1.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84851
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84851
aws.amazon.com
https://aws.amazon.com/security/security-bulletins/2026-094-aws/
github.com
https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6
github.com
https://github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44