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Vulnerabilities

Security fix · CVE-2026-23956

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities.

Published Jan 22, 2026 · catalog updated May 20, 2026 · seroval facilitates JS value

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-23956. EPSS is 0.53%. Act only if a listed version of seroval facilitates JS value is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (seroval facilitates JS value).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.53%
Remediation
Version ranges on file
Affected products
vendor lxsmnsyc seroval 0.2.0, < 1.4.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor lxsmnsyc seroval 0.2.0, < 1.4.10.2.0, < 1.4.1

How to fix CVE-2026-23956

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-23956. EPSS is 0.53%. Act only if a listed version of seroval facilitates JS value is installed.

Which versions are affected?

Compare what you have installed with lxsmnsyc seroval 0.2.0, < 1.4.1 0.2.0, < 1.4.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 22, 2026 · EUVD

    Detected

    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 Expres

  2. May 20, 2026 · EUVD

    Updated

    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 Expres

Sources

  • CVE.orgVulnerability recordCVE-2026-23956

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-23956

    30-day exploitation probability 0.53%

    first.org
  • EUVDVulnerability recordEUVD-2026-3669

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026