CVE CVE-2026-23956

CVE-2026-23956

Express

Severity: HIGH
CVSS: 7.5CVSS
Published: 2026-01-22
Last modified: 2026-02-27
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-1333

Description

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, 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.

References

https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060
https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hx9m-jf43-8ffr

Summary

Description

References