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TI-2026-19298 Aliases CVE-2026-23956GHSA-hx9m-jf43-8ffr

seroval affected by Denial of Service via RegExp serialization

Priority MEDIUM 40CWE-1333Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 0.2.0 through 1.4.0, overriding RegExp serialization with extremely large patterns can exhaust JavaScript runtime memory during deserialization. Additionally, overriding RegExp serialization with patterns that trigger catastrophic backtracking can lead to ReDoS (Regular Expression Denial of Service). This issue has been fixed in version 1.4.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00534 45th 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
lxsmnsycseroval0.2.0 to before 1.4.11.4.1Patch availableCNA
—seroval (npm)0.2.0 to before 1.4.11.4.1Patch availableGHSA-hx9m-jf43-8ffr
  • seroval Vendorlxsmnsyc Affected 0.2.0 to before 1.4.1 Fixed in 1.4.1 Patch available CNA
  • seroval (npm) Vendor— Affected 0.2.0 to before 1.4.1 Fixed in 1.4.1 Patch available GHSA-hx9m-jf43-8ffr

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-hx9m-jf43-8ffr 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-2026-23956
  2. 2026-10-03 Alias added: GHSA-hx9m-jf43-8ffr

References

Patch 1

Advisory 2

Other 2

  • TI-2026-19109 seroval Affected by Prototype Pollution via JSON Deserialization CVSS 3.1CRITICAL 9.8
  • 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