Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of CVE-2026-59940)

{
  "id": "942b1b6ecac83eeaa821e32c9d86587a6f9d585deecfe3202763c1e9cf1620f2",
  "url": "https://osv.dev/vulnerability/CVE-2026-104846",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of CVE-2026-59940)",
    "summary": "Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. From 0.12.0 until 1.6.2, fromJSON deserialization of a fulfilled Promise control node can pass a plugin-produced callable-bearing thenable to a native Promise resolver. ECMAScript thenable assimilation then invokes the callable unexpectedly, allowing attacker-controlled JSON to trigger code in applications using plugin-capable Seroval releases. This path bypasses the Promise resolver type-confusion remediation in version 1.5.3 for CVE-2026-59940 because the unexpected invocation occurs through native Promise settlement after the referenced value is deserialized. This issue is fixed in version 1.6.2.",
    "evidence": "osv:CVE-2026-104846",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-104846",
      "aliases": [
        "CVE-2026-104846",
        "GHSA-p6vx-979v-rg4c"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/lxsmnsyc/seroval",
              "type": "GIT",
              "events": [
                {
                  "introduced": "48c2471aa7c00af0409a9bf7313a6d135055cab6"
                },
                {
                  "fixed": "621a4291bc06da75650d9e5f61ad7bde8b1a19ca"
                },
                {
                  "fixed": "f1ffcc96d259f9b5b3d71feb262b58240c90e7b7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.12.0"
                      },
                      {
                        "fixed": "1.6.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f1ffcc96d259f9b5b3d71feb262b58240c90e7b7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "seroval@1.6.1",
            "seroval-plugins@1.6.1",
            "seroval@1.6.0",
            "seroval-plugins@1.6.0",
            "v1.5.5",
            "seroval@1.5.5",
            "seroval-plugins@1.5.5",
            "seroval@1.5.2",
            "seroval-plugins@1.5.2",
            "seroval@1.5.1",
            "seroval-plugins@1.5.1",
            "seroval@1.5.0",
            "seroval-plugins@1.5.0",
            "1.5.0",
            "1.4.2",
            "seroval@1.4.0",
            "seroval-plugins@1.4.0",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.1",
            "v1.1.0",
            "v1.0.8",
            "v1.0.7",
            "v1.0.6",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.15.1",
            "v0.15.0",
            "v0.14.1",
            "v0.14.0",
            "v0.13.2",
            "v0.13.1",
            "v0.13.0",
            "v0.12.4",
            "v0.12.3",
            "v0.12.2",
            "v0.12.1",
            "v0.12.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104846.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.061065357Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104846.json",
        "https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-p6vx-979v-rg4c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104846",
        "https://github.com/lxsmnsyc/seroval/commit/f1ffcc96d259f9b5b3d71feb262b58240c90e7b7"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-843"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104846.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104846",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517573,
  "published_at": "2026-10-02T15:59:45.802+00:00"
}