{
  "affected": [
    {
      "database_specific": {
        "unresolved_ranges": [
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "UTF-8"
              }
            ]
          }
        ]
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "49c53b55e1245a8aa161054dda41829fd687766a"
            }
          ],
          "repo": "https://github.com/amazon-ion/ion-c",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-7mgf-6x73-5h7r"
  ],
  "details": "An uninitialized stack read issue exists in Amazon Ion-C versions \u003cv1.1.4 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.",
  "id": "CVE-2025-12829",
  "modified": "2026-03-15T21:45:42.896748335Z",
  "published": "2025-11-07T18:15:35.590Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://aws.amazon.com/security/security-bulletins/AWS-2025-027/"
    },
    {
      "type": "WEB",
      "url": "https://github.com/amazon-ion/ion-c/releases/tag/v1.1.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/amazon-ion/ion-c/security/advisories/GHSA-7mgf-6x73-5h7r"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}