CVE-2026-23956
HIGH7.5EPSS 0.07%seroval affected by Denial of Service via RegExp serialization
Published: 1/21/2026Modified: 5/20/2026
Also known as:GHSA-hx9m-jf43-8ffr
Description
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). **Mitigation**: `Seroval` introduces `disabledFeatures` (a bitmask) in serialization/deserialization methods, with `Feature.RegExp` as a dedicated flag. **Users are recommended to configure `disabledFeatures` to disable RegExp serialization entirely.**
Affected packages (1)
- npm/seroval>= 0.2.0, < 1.4.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (5)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-23956
- PATCHhttps://github.com/lxsmnsyc/seroval
- WEBhttps://github.com/lxsmnsyc/seroval/blob/v0.2.0/packages/seroval/src/index.ts#L90
- WEBhttps://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060
- WEBhttps://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hx9m-jf43-8ffr