Medium 6.2Published Nov 7, 2025

CVE-2025-12829An 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…

Updated under an hour ago (Oct 27, 2026, 8:00 AM ET)

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It affects Amazon Ion-C. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Amazon Ion-C

Exploited in the last 30 days

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.

CVSS: 6.2 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Deferred
Record last updated: Nov 7, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Amazon Ion-C amazon:ion_c (from the name)	1.1.4 not affected	CNA record

References

References

https://aws.amazon.com/security/security-bulletins/AWS-2025-027/	vendor-advisory
https://github.com/amazon-ion/ion-c/releases/tag/v1.1.4	patch
https://github.com/amazon-ion/ion-c/security/advisories/GHSA-7mgf-6x73-5h7r	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.