{"id":"CVE-2025-12829","title":"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 sequence…","summary":"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 sequence…","severity":"medium","cvss":6.2,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-125"],"published":"2025-11-07","updated":"2026-10-07","sourceUpdated":"2026-10-07T21:10:00.200","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-12829","references":[{"url":"https://aws.amazon.com/security/security-bulletins/AWS-2025-027/","label":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/amazon-ion/ion-c/releases/tag/v1.1.4","label":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/amazon-ion/ion-c/security/advisories/GHSA-7mgf-6x73-5h7r","label":"ff89ba41-3aa1-4d27-914a-91399e9639e5"}],"tags":["nvd"],"epss":0.00152,"epssPercentile":0.03771,"ingestedAt":"2026-10-07T21:54:14.979Z","slug":"CVE-2025-12829","body":"## Overview\n\nAn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":34.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}