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TI-2026-19109 Aliases CVE-2026-23736GHSA-hj76-42vx-jwp4

seroval Affected by Prototype Pollution via JSON Deserialization

Priority MEDIUM 48CWE-1321Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization. This vulnerability affects only JSON deserialization functionality. This issue is fixed in version 1.4.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00302 23rd percentileScored 2026-11-07
Fix Fixed seroval (lxsmnsyc): 1.4.1seroval (npm): 1.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
lxsmnsycserovalbefore 1.4.11.4.1Patch availableCNA
—seroval (npm)before 1.4.11.4.1Patch availableGHSA-hj76-42vx-jwp4
  • seroval Vendorlxsmnsyc Affected before 1.4.1 Fixed in 1.4.1 Patch available CNA
  • seroval (npm) Vendor— Affected before 1.4.1 Fixed in 1.4.1 Patch available GHSA-hj76-42vx-jwp4

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:lxsmnsyc:seroval:*:*:*:*:*:node.js:*:*before 1.4.1Vulnerablelxsmnsyc
  • cpe:2.3:a:lxsmnsyc:seroval:*:*:*:*:*:node.js:*:* Versions before 1.4.1 Vulnerable ·lxsmnsyc

Remediation

  • Fix · CNA seroval (lxsmnsyc) Fixed in 1.4.1
  • Fix · GHSA-hj76-42vx-jwp4 seroval (npm) Fixed in 1.4.1 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23736
  2. 2026-10-03 Alias added: GHSA-hj76-42vx-jwp4

References

Patch 1

Advisory 2

Other 1

  • TI-2026-19298 seroval affected by Denial of Service via RegExp serialization CVSS 3.1HIGH 7.5
  • TI-2026-19345 Seroval affected by Denial of Service via Deeply Nested Objects CVSS 3.1HIGH 7.5
  • TI-2026-19299 seroval is vulnerable to Denial of Service via array serialization CVSS 3.1HIGH 7.5
  • TI-2026-19110 seroval Affected by Remote Code Execution via JSON Deserialization CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences