CVE-2025-12829
Bulletin ID: AWS-2025-027 Scope: Amazon Content Type: Important (requires attention) Publication Date: 2025/11/7 10:15 AM PDT Description: Amazon's Ion-C is a library for the C language that is used to read and write Amazon Ion data. We Identified CVE-2025-12829, which describes an uninitialized stack read issue in 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. Impacted versions: < v1.1.4
CSIRTS triage
- What
- An uninitialized stack read issue may expose sensitive data in memory.
- Who is affected
- Users of Ion-C versions earlier than 1.1.4.
- Urgency
- Remediation is important to prevent sensitive data exposure.
- Action
- Upgrade to version 1.1.4 or later.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
Advisory coverage (1)
- unknownCVE-2025-12829 - Integer Overflow issue in Amazon Ion-Caws · 2026-06-05
External references
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