CVE-2026-23956

seroval affected by Denial of Service via RegExp serialization

CVSS 7.5 HIGHEPSS 0.5%CWE-1333

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

22 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

lxsmnsyc · seroval

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References

https://github.com/lxsmnsyc/seroval/blob/v0.2.0/packages/seroval/src/index.ts#L90 https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060 https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hx9m-jf43-8ffr