CVE-2026-104846 (GCVE-0-2026-104846)

Vulnerability from cvelistv5 – Published: 2026-10-02 15:59 – Updated: 2026-10-02 15:59
VLAI
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
Assigner
References
Impacted products
Vendor Product Version CPE status
lxsmnsyc seroval Affected: >= 0.12.0, < 1.6.2
guessed Create a notification for this product.
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              "cweId": "CWE-843",
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      "providerMetadata": {
        "dateUpdated": "2026-10-02T15:59:45.802Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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        "discovery": "UNKNOWN"
      },
      "title": "Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of CVE-2026-59940)"
    }
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  "cveMetadata": {
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    "cveId": "CVE-2026-104846",
    "datePublished": "2026-10-02T15:59:45.802Z",
    "dateReserved": "2026-10-02T14:38:43.243Z",
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    "state": "PUBLISHED"
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          }
        ],
        "id": "CVE-2026-104846",
        "lastModified": "2026-10-02T16:16:47.363",
        "metrics": {
          "cvssMetricV31": [
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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