CVE-2025-12829
CVE-2025-12829 is a medium-severity vulnerability with a CVSS 3.x base score of 6.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Medium (CVSS 3.x base score 6.2)
- CVSS v4: 6.9
- EPSS exploit prediction: 0% (4th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-38328
- Weakness: CWE-125
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2025-12829?
- 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.
- How severe is CVE-2025-12829?
- CVE-2025-12829 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2025-12829 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-12829?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-12829 have an EU (EUVD) identifier?
- Yes. CVE-2025-12829 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38328.
- When was CVE-2025-12829 published?
- CVE-2025-12829 was published on 2025-11-07 and last updated on 2026-06-17.
References
- https://aws.amazon.com/security/security-bulletins/AWS-2025-027/
- 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
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