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CVE-2026-104846 — Vulnerability in seroval — CVE Details

CRITICAL

Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of GHSA-mv8w-475r-vwqw)

Published October 5, 2026Updated October 6, 2026Source: osv

Summary

A fulfilled Promise node deserialized by `fromJSON()` can trigger unintended invocation of a plugin-produced callable through native ECMAScript thenable assimilation. This bypasses the type-confusion fix in `seroval@1.5.3` (GHSA-mv8w-475r-vwqw / CVE-2026-59940) and affects every plugin-capable release from `0.12.0` through the current `1.6.0`.

Advisory Timeline

  • First published October 5, 2026 (6 days ago).
  • Last revised October 6, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update seroval to 1.6.2 or later
npm install seroval@1.6.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
seroval
npm
All versions1.6.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-104846?
Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of GHSA-mv8w-475r-vwqw) This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-104846?
CVE-2026-104846 affects seroval. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-104846 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-p6vx-979v-rg4c

Related CVEs

  • CVE-2026-59940
    CRITICAL

    seroval: `seroval.fromJSON()` Promise resolver type confusion invokes attacker-controlled methods during deserialization

  • CVE-2026-107722
    CRITICAL

    fast-jwt: Incomplete patch of CVE-2026-34950: Non-whitespace key-prefix re-enables RSA→HS256 algorithm confusion

  • CVE-2026-108261
    CRITICAL

    TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment

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