CVE-2026-23737: seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities

Routine

HIGH 7.5UPGRADE

CVE-2026-23737 is a high-severity flaw (CVSS 7.5) affecting seroval. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution. Exploitation is possible via overriding constant value and error deserialization, allowing indirect access to unsafe JS evaluation. At minimum, attackers need the ability to perform 4 separate reques

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-01-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: lxsmnsyc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-21 23:15 UTCPublished CVE record published
2026-06-17 10:22 UTCUpdated Record last modified

lxsmnsyc seroval UPGRADE

Affected: < 1.4.1

Fixed in: 1.4.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls seroval

2. UPGRADE to 1.4.1

npm install seroval@">=1.4.1"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23737?

seroval: upgrade to 1.4.1. Exact commands for each OS are on this page.

Is CVE-2026-23737 being exploited?

CVE-2026-23737 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23737 affect?

CVE-2026-23737 affects seroval. Severity is high (CVSS 7.5). seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code

How urgent is CVE-2026-23737?

Priority 38/100. High severity

Related CVEs

CVE-2026-24006 HIGH 7.5 UPGRADE Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities
CVE-2026-23957 HIGH 7.5 UPGRADE seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities
CVE-2026-23956 HIGH 7.5 UPGRADE seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities
CVE-2026-23736 HIGH 7.3 UPGRADE seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities

References

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