{"id":"CVE-2026-23956","aliases":["EUVD-2026-3669","GHSA-hx9m-jf43-8ffr"],"status":"published","title":"seroval affected by Denial of Service via RegExp serialization","description":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00534,"percentile":0.45507,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333"],"published":"2026-01-21T16:57:06Z","modified":"2026-10-28T02:30:59Z","fixes":[{"ecosystem":"npm","package":"seroval","fixed_in":["1.4.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"seroval","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.2.0"},{"last_affected":"1.4.0"},{"fixed":"1.4.1"}]}]},{"source":"osv","ecosystem":"npm","package":"seroval","ranges":[{"type":"SEMVER","events":[{"introduced":"0.2.0"},{"fixed":"1.4.1"}]}]}],"products":[{"vendor":"lxsmnsyc","product":"seroval"}],"references":[{"url":"https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hx9m-jf43-8ffr","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/lxsmnsyc/seroval/blob/v0.2.0/packages/seroval/src/index.ts#L90","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23956","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-hx9m-jf43-8ffr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23956.json","tags":["advisory"]},{"url":"https://github.com/lxsmnsyc/seroval","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-23956","title":"seroval affected by Denial of Service via RegExp serialization","description":"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.","status":"published","published":"2026-01-22T01:23:58.922Z","modified":"2026-05-20T00:53:15.264Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T13:42:15.603999Z"}],"euvd":[{"id":"EUVD-2026-3669","description":"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.","status":"published","published":"2026-01-22T01:23:58Z","modified":"2026-05-20T00:53:15Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:21:15.217097Z"}],"ghsa":[{"id":"GHSA-hx9m-jf43-8ffr","title":"seroval affected by Denial of Service via RegExp serialization","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).  \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.**","status":"published","published":"2026-01-21T16:57:06Z","modified":"2026-05-20T00:53:28Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:40:13.628377Z"}],"nvd":[{"id":"CVE-2026-23956","description":"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.","status":"published","published":"2026-01-22T02:15:52.31Z","modified":"2026-06-17T10:22:20.97Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:12:04.423757Z"}],"osv":[{"id":"CVE-2026-23956","title":"seroval affected by Denial of Service via RegExp serialization","description":"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.","status":"published","published":"2026-01-22T01:23:58.922Z","modified":"2026-10-28T02:30:59.725298678Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:44:59.079784Z"},{"id":"GHSA-hx9m-jf43-8ffr","title":"seroval affected by Denial of Service via RegExp serialization","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).  \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.**","status":"published","published":"2026-01-21T16:57:06Z","modified":"2026-05-20T01:00:15.710504617Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:46:49.621585Z"}]}}