How severe is CVE-2026-23957?

CVE-2026-23957 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-23957 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23957?

CVE-2026-23957 affects Lxsmnsyc Seroval. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23957?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-23957 have an EU (EUVD) identifier?

Yes. CVE-2026-23957 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3668.

When was CVE-2026-23957 published?

CVE-2026-23957 was published on 2026-01-22 and last updated on 2026-06-17.

CVE-2026-23957

CVE-2026-23957 is a high-severity vulnerability in Lxsmnsyc Seroval with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3668
Weakness: CWE-770
Affected product: Lxsmnsyc Seroval
Published: 2026-01-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-23957?: CVE-2026-23957 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-23957 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23957?: CVE-2026-23957 affects Lxsmnsyc Seroval. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23957?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23957 have an EU (EUVD) identifier?: Yes. CVE-2026-23957 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3668.
When was CVE-2026-23957 published?: CVE-2026-23957 was published on 2026-01-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lxsmnsyc:seroval:*:*:*:*:*:node.js:*:*

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