{"id":"CVE-2026-23956","aliases":["GHSA-hx9m-jf43-8ffr"],"url":"https://o3.security/vulnerability/CVE-2026-23956","summary":"seroval affected by Denial of Service via RegExp serialization","details":"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).  \n\n**Mitigation**:  \n`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.**","published":"2026-01-22T01:23:58.922Z","modified":"2026-08-12T03:51:14.023136661Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00511,"percentile":0.42379,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"seroval","fixedVersion":"1.4.1"}],"fix":{"url":"https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060","label":"lxsmnsyc/seroval@ce9408e"},"references":[{"type":"WEB","url":"https://github.com/lxsmnsyc/seroval/blob/v0.2.0/packages/seroval/src/index.ts#L90"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23956.json"},{"type":"ADVISORY","url":"https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hx9m-jf43-8ffr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23956"},{"type":"FIX","url":"https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060"},{"type":"PACKAGE","url":"https://github.com/lxsmnsyc/seroval"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:14.023136661Z"}}