high7.5
CVE-2026-23956
seroval affected by Denial of Service via RegExp serialization
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | seroval | >= 0.2.0, <= 1.4.0 | 1.4.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Lxsmnsyc | Seroval | before 1.4.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- 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
- https://github.com/advisories/GHSA-hx9m-jf43-8ffr
- https://nvd.nist.gov/vuln/detail/CVE-2026-23956