What is CVE-2026-23957?

CVE-2026-23957 is a high-severity vulnerability in Lxsmnsyc Seroval, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-01-22.

How severe is CVE-2026-23957?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Lxsmnsyc Seroval

CVE-2026-23957

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, overriding encoded array lengths by replacing them with an excessively large value causes the deserialization process to significantly increase processing time. This issue has been fixed in version 1.4.1.

Published 2026-01-22 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (36.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Lxsmnsyc Seroval — versions < 1.4.1

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/lxsmnsyc/seroval/security/advisories/GHSA-66fc-rw6m-c2q6 (Mitigation, Vendor Advisory)
github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060 (Patch)

Frequently asked questions

What is CVE-2026-23957?: CVE-2026-23957 is a high-severity vulnerability in Lxsmnsyc Seroval, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-01-22.
How severe is CVE-2026-23957?: High severity. CVSS v3 base score is 7.5 out of 10.