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CVE-2025-12829

Good to know:

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Date: November 7, 2025

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.

Severity Score

Related Resources (5)

https://github.com/amazon-ion/ion-c/releases/tag/v1.1.4
https://github.com/amazon-ion/ion-c/security/advisories/GHSA-7mgf-6x73-5h7r
https://nvd.nist.gov/vuln/detail/CVE-2025-12829
https://aws.amazon.com/security/security-bulletins/AWS-2025-027/
https://www.mend.io/vulnerability-database/CVE-2025-12829

Severity Score

Weakness Type (CWE)

Out-of-bounds Read

CWE-125

Top Fix

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Upgrade Version

Upgrade to version https://github.com/amazon-ion/ion-c.git - v1.1.4

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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