Vulnerability in Lxsmnsyc Seroval
CVE-2026-23956
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
EPSS: 0.005 (38.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Lxsmnsyc Seroval — versions < 1.4.1, >= 0.2.0, < 1.4.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-23956?
- CVE-2026-23956 is a high-severity vulnerability in Lxsmnsyc Seroval, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-01-22.
- How severe is CVE-2026-23956?
- High severity. CVSS v3 base score is 7.5 out of 10.