CVE-2025-12829

Medium

Description

An uninitialized stack read issue exists in Amazon Ion-C versions <v1.1.4 that may allow a threat actor to craft data and serialize it to Ion text in such a way that sensitive data in memory could be exposed through UTF-8 escape sequences. To mitigate this issue, users should upgrade to version v1.1.4.

SeverityMedium

CVSS6.2

Exploit probability—

ProductIon-C

PublishedNov 7, 2025

First seenNov 7, 2025

Weakness typeCWE-125Out-of-bounds read

How to fix

Update

Amazon Ion-C1.1.4 or later

Patches

github.com/amazon-ion/ion-c/releases/tag/v1.1.4

Vendor advisories

aws.amazon.com/security/security-bulletins/AWS-2025-027/
github.com/amazon-ion/ion-c/security/advisories/GHSA-7mgf-6x73-5h7r

Affected products

Product	Affected versions	Fixed in
Amazon Ion-C	No range specified	1.1.4

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.