seroval Affected by Remote Code Execution via JSON Deserialization

CVE-2026-23737 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution.

The vulnerability can be exploited via overriding constant value and error deserialization, which allows indirect access to unsafe JS evaluation. This requires at least the ability to perform 4 separate requests on the same function and partial knowledge of how the serialized data is used during later runtime processing.

This vulnerability affects the fromJSON and fromCrossJSON functions in a client-to-server transmission scenario.

No known workarounds or mitigations are known, so please upgrade to the patched version.

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-01-21 15:41:22 UTC
Updated
2026-01-22 15:39:50 UTC
GitHub reviewed
2026-01-21 15:41:22 UTC
NVD published
2026-01-21

EPSS Score

Score Percentile
0.10% 26.68%

CVSS Scores

Base score Version Severity Vector
7.5 3.1 —
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-3rxj-6cgf-8cfw ↗
CVE CVE-2026-23737 ↗

CWEs

CWE id Name
CWE-502 Deserialization of Untrusted Data

Credits

  • GabbeV (finder)
  • tweidinger (other)
  • lxsmnsyc (coordinator)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm seroval < 1.4.1 1.4.1 —

References

cvelogic Threat Intelligence