{"cve":"CVE-2021-4437","nvd":{"published":"2024-02-12T20:15:07.993","modified":"2026-06-17T04:19:45.340","status":"Modified","description":"A vulnerability, which was classified as problematic, has been found in dbartholomae lambda-middleware frameguard up to 1.0.4. Affected by this issue is some unknown functionality of the file packages/json-deserializer/src/JsonDeserializer.ts of the component JSON Mime-Type Handler. The manipulation leads to inefficient regular expression complexity. Upgrading to version 1.1.0 is able to address this issue. The patch is identified as f689404d830cbc1edd6a1018d3334ff5f44dc6a6. It is recommended to upgrade the affected component. VDB-253406 is the identifier assigned to this vulnerability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-1333"],"references":["https://github.com/dbartholomae/lambda-middleware/commit/f689404d830cbc1edd6a1018d3334ff5f44dc6a6","https://github.com/dbartholomae/lambda-middleware/pull/57","https://github.com/dbartholomae/lambda-middleware/releases/tag/%40lambda-middleware%2Fframeguard_v1.1.0","https://vuldb.com/?ctiid.253406","https://vuldb.com/?id.253406"],"products":["dbartholomae:lambda-middleware"],"source":"nvd","synced_at":"2026-10-19T21:45:59.823092188+00:00"},"epss":{"cve":"CVE-2021-4437","score":0.00446,"percentile":0.38814,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m3f4-957x-m785","url":"https://osv.dev/vulnerability/GHSA-m3f4-957x-m785","summary":"lambda-middleware Inefficient Regular Expression Complexity vulnerability","modified":"2024-03-01T14:41:48Z","packages":[{"ecosystem":"npm","name":"@lambda-middleware/json-deserializer","purl":"pkg:npm/%40lambda-middleware/json-deserializer","ranges":["<1.1.0"],"fixed":["1.1.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}