CVE-2026-84851

8.7 highEPSS 0.6%

High (8.7). EPSS 0.6% chance of exploitation in the next 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.

Severity

CVSS 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

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-31)
CWE: CWE-674
Published: 2026-09-03
Modified: 2026-09-03
Record from: the NVD, synced 2026-10-19

References

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

Check your stack JSON