{"cve":"CVE-2009-4492","nvd":{"published":"2010-01-13T20:30:00.530","modified":"2026-06-16T23:13:46.207","status":"Modified","description":"WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://secunia.com/advisories/37949","http://securitytracker.com/id?1023429","http://www.redhat.com/support/errata/RHSA-2011-0908.html","http://www.redhat.com/support/errata/RHSA-2011-0909.html","http://www.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injection"],"products":["ruby-lang:webrick"],"source":"nvd","synced_at":"2026-10-19T19:55:32.599380760+00:00"},"epss":{"cve":"CVE-2009-4492","score":0.1623,"percentile":0.96946,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-6mq2-37j5-w6r6","url":"https://osv.dev/vulnerability/GHSA-6mq2-37j5-w6r6","summary":"WEBrick Improper Input Validation vulnerability","modified":"2025-05-22T17:48:00.252889Z","packages":[{"ecosystem":"RubyGems","name":"webrick","purl":"pkg:gem/webrick","ranges":["<1.4.0"],"fixed":["1.4.0"]}]}],"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."]}