Out-of-bounds Read Affecting amazon-ion/ion-c package, versions [,1.1.4)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-AMAZONIONIONC-13865268
- published10 Nov 2025
- disclosed7 Nov 2025
- creditUnknown
Introduced: 7 Nov 2025
NewCVE-2025-12829 (opens in a new tab)How to fix?
Upgrade amazon-ion/ion-c to version 1.1.4 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read via the debug_malloc function in the ionc/ion_allocation.c. An attacker can access sensitive data in memory by crafting malicious data that, when serialized to Ion text, exposes information through UTF-8 escape sequences.