{"cve":"CVE-2022-4891","nvd":{"published":"2023-01-17T20:15:11.757","modified":"2026-06-17T05:22:07.933","status":"Modified","description":"A vulnerability has been found in Sisimai up to 4.25.14p11 and classified as problematic. This vulnerability affects the function to_plain of the file lib/sisimai/string.rb. The manipulation leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. Upgrading to version 4.25.14p12 is able to address this issue. The name of the patch is 51fe2e6521c9c02b421b383943dc9e4bbbe65d4e. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-218452.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1333"],"references":["https://gist.githubusercontent.com/gmcabrita/e5dc0332473fc2e3a7a407434c8d21c7/raw/00b12035e5e1b685469f143b94301a50306376ba/example.html","https://github.com/sisimai/rb-sisimai/commit/51fe2e6521c9c02b421b383943dc9e4bbbe65d4e","https://github.com/sisimai/rb-sisimai/pull/244","https://github.com/sisimai/rb-sisimai/releases/tag/v4.25.14p12","https://vuldb.com/?ctiid.218452"],"products":["libsisimai:sisimai"],"source":"nvd","synced_at":"2026-10-19T21:37:34.931465858+00:00"},"epss":{"cve":"CVE-2022-4891","score":0.01386,"percentile":0.72233,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vm74-j4wq-82xj","url":"https://osv.dev/vulnerability/GHSA-vm74-j4wq-82xj","summary":"Sisimai Inefficient Regular Expression Complexity vulnerability","modified":"2026-02-22T23:09:38.471873Z","packages":[{"ecosystem":"RubyGems","name":"sisimai","purl":"pkg:gem/sisimai","ranges":["<4.25.14p12"],"fixed":["4.25.14p12"]}]}],"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."]}