CVE-2026-23956: seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities

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HIGH 7.5REMOTEUPGRADE

CVE-2026-23956 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 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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-1333
Published	2026-01-22
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

2026-01-22 02:15 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-2026-23956?

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

Is CVE-2026-23956 being exploited?

CVE-2026-23956 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-2026-23956 affect?

CVE-2026-23956 affects seroval. Severity is high (CVSS 7.5). 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 mem

How urgent is CVE-2026-23956?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

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-2026-23737 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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