CVE-2025-12829

State: Published
Severity: 6.9 Medium
Published: Nov 7, 2025
Updated: Nov 7, 2025
Reserved: Nov 6, 2025

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	AMZN
3.1	6.2 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	AMZN

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
Ion-CAmazon	1.1.4Not affected

References

https://aws.amazon.com/security/security-bulletins/AWS-2025-027/vendor-advisory
https://github.com/amazon-ion/ion-c/releases/tag/v1.1.4patch
https://github.com/amazon-ion/ion-c/security/advisories/GHSA-7mgf-6x73-5h7rvendor-advisory

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