quickjs — security advisory

{
  "id": "83f01d4411d95d094e96b653f67e40c7f1e25400b619fc968bf8df94b0291f1f",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-62494",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2025-62494",
    "summary": "A type confusion vulnerability exists in the handling of the string addition (+) operation within the QuickJS engine. * The code first checks if the left-hand operand is a string. * It then attempts to convert the right-hand operand to a primitive value using JS_ToPrimitiveFree. This conversion can trigger a callback (e.g., toString or valueOf). * During this callback, an attacker can modify the type of the left-hand operand in memory, changing it from a string to a different type (e.g., an object or an array). * The code then proceeds to call JS_ConcatStringInPlace, which still treats the modified left-hand value as a string. This mismatch between the assumed type (string) and the actual type allows an attacker to control the data structure being processed by the concatenation logic, resulting in a type confusion condition. This can lead to out-of-bounds memory access, potentially resulting in memory corruption and arbitrary code execution in the context of the QuickJS runtime.",
    "evidence": "osv:DEBIAN-CVE-2025-62494",
    "products": [
      {
        "name": {
          "value": "quickjs",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2025.04.26-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "quickjs",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2025.04.26-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2025-62494",
      "aliases": [
        "DEBIAN-CVE-2025-62494"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "quickjs",
            "purl": "pkg:deb/debian/quickjs?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "2025.04.26-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-62494.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "quickjs",
            "purl": "pkg:deb/debian/quickjs?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "2025.04.26-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-62494.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T17:47:26.661149007Z",
      "provider": "osv",
      "upstream": [
        "CVE-2025-62494"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2025-62494"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2025-62494",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 416956,
  "published_at": "2025-10-16T16:15:39.943+00:00"
}