CVE-2025-12829: CWE-125: Out-of-bounds Read in Amazon Ion-C
CVE-2025-12829 is an out-of-bounds read vulnerability in Amazon Ion-C versions prior to v1.1.4. It involves an uninitialized stack read triggered by specially crafted Ion text data, potentially exposing sensitive memory data via UTF-8 escape sequences. The vulnerability has a medium severity with a CVSS 4.0 base score of 6.9. Users are advised to upgrade to version v1.1.4 to mitigate this issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2025-12829) affects Amazon Ion-C, a data serialization library. The flaw is an out-of-bounds read (CWE-125) caused by uninitialized stack memory being read when processing specially crafted Ion text data. This can lead to exposure of sensitive memory contents through UTF-8 escape sequences. The issue is fixed in Amazon Ion-C version v1.1.4. The CVSS 4.0 vector indicates local attack vector with low complexity and no privileges or user interaction required, with high impact on confidentiality.
Potential Impact
An attacker who can supply specially crafted Ion text data to a vulnerable version of Amazon Ion-C may cause the library to read uninitialized stack memory, potentially leaking sensitive information. The vulnerability does not require privileges or user interaction but requires local access. The confidentiality impact is high, while integrity and availability impacts are none. There are no known exploits in the wild at this time.
Mitigation Recommendations
Users should upgrade to Amazon Ion-C version v1.1.4, which addresses this vulnerability. Since this is a library vulnerability and not a cloud service, remediation depends on updating the affected software. Patch status is confirmed by the vendor advisory indicating the fix is available in v1.1.4.
CVE-2025-12829: CWE-125: Out-of-bounds Read in Amazon Ion-C
Description
CVE-2025-12829 is an out-of-bounds read vulnerability in Amazon Ion-C versions prior to v1.1.4. It involves an uninitialized stack read triggered by specially crafted Ion text data, potentially exposing sensitive memory data via UTF-8 escape sequences. The vulnerability has a medium severity with a CVSS 4.0 base score of 6.9. Users are advised to upgrade to version v1.1.4 to mitigate this issue.
CVSS v4.0
Score 6.9medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2025-12829) affects Amazon Ion-C, a data serialization library. The flaw is an out-of-bounds read (CWE-125) caused by uninitialized stack memory being read when processing specially crafted Ion text data. This can lead to exposure of sensitive memory contents through UTF-8 escape sequences. The issue is fixed in Amazon Ion-C version v1.1.4. The CVSS 4.0 vector indicates local attack vector with low complexity and no privileges or user interaction required, with high impact on confidentiality.
Potential Impact
An attacker who can supply specially crafted Ion text data to a vulnerable version of Amazon Ion-C may cause the library to read uninitialized stack memory, potentially leaking sensitive information. The vulnerability does not require privileges or user interaction but requires local access. The confidentiality impact is high, while integrity and availability impacts are none. There are no known exploits in the wild at this time.
Mitigation Recommendations
Users should upgrade to Amazon Ion-C version v1.1.4, which addresses this vulnerability. Since this is a library vulnerability and not a cloud service, remediation depends on updating the affected software. Patch status is confirmed by the vendor advisory indicating the fix is available in v1.1.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2025-11-06T19:31:27.190Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 690e35acf29beb96f88f84a3
Added to database: 11/07/2025, 18:08:44 UTC
Last enriched: 06/05/2026, 19:29:19 UTC
Last updated: 08/18/2026, 10:54:19 UTC
Views: 161
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