{"cve":"CVE-2025-15104","nvd":{"published":"2026-01-16T14:15:54.317","modified":"2026-06-17T08:37:07.217","status":"Analyzed","description":"Nu Html Checker (validator.nu) contains a restriction bypass that allows remote attackers to make the server perform arbitrary HTTP/HTTPS requests to internal resources, including localhost services. While the validator implements hostname-based protections to block direct access to localhost and 127.0.0.1, these controls can be bypassed using DNS rebinding techniques or domains that resolve to loopback addresses.This issue affects The Nu Html Checker (vnu): latest (commit 23f090a11bab8d0d4e698f1ffc197a4fe226a9cd).","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N","score":6.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-918"],"references":["https://fluidattacks.com/advisories/europe","https://github.com/validator/validator","https://fluidattacks.com/advisories/europe"],"products":["validator:validator"],"source":"nvd","synced_at":"2026-10-19T22:21:16.563232421+00:00"},"epss":{"cve":"CVE-2025-15104","score":0.00465,"percentile":0.4031,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-fccg-7w3p-w66f","url":"https://osv.dev/vulnerability/GHSA-fccg-7w3p-w66f","summary":"Nu Html Checker (vnu) contains a Server-Side Request Forgery (SSRF) vulnerability","modified":"2026-02-03T03:17:09.292455Z","packages":[{"ecosystem":"Maven","name":"nu.validator:validator","purl":"pkg:maven/nu.validator/validator","ranges":["<=26.1.11"],"fixed":[]},{"ecosystem":"npm","name":"vnu-jar","purl":"pkg:npm/vnu-jar","ranges":["<=26.1.11"],"fixed":[]}]}],"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."]}