{"cve":"CVE-2026-32136","nvd":{"published":"2026-03-11T22:16:33.423","modified":"2026-06-17T10:35:12.037","status":"Analyzed","description":"AdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.73, an unauthenticated remote attacker can bypass all authentication in AdGuardHome by sending an HTTP/1.1 request that requests an upgrade to HTTP/2 cleartext (h2c). Once the upgrade is accepted, the resulting HTTP/2 connection is handled by the inner mux, which has no authentication middleware attached. All subsequent HTTP/2 requests on that connection are processed as fully authenticated, regardless of whether any credentials were provided. This vulnerability is fixed in 0.107.73.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-287"],"references":["https://github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-5fg6-wrq4-w5gh"],"products":["adguard:adguardhome"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-32136","score":0.00765,"percentile":0.55457,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-5fg6-wrq4-w5gh","url":"https://osv.dev/vulnerability/GHSA-5fg6-wrq4-w5gh","summary":"AdGuard Home: HTTP/2 Cleartext (h2c) Upgrade Authentication Bypass","modified":"2026-03-23T04:56:10.869010885Z","packages":[{"ecosystem":"Go","name":"github.com/AdguardTeam/AdGuardHome","purl":"pkg:golang/github.com/AdguardTeam/AdGuardHome","ranges":["<0.107.73"],"fixed":["0.107.73"]}]},{"id":"GO-2026-4686","url":"https://osv.dev/vulnerability/GO-2026-4686","summary":"AdGuard Home: HTTP/2 Cleartext (h2c) Upgrade Authentication Bypass in github.com/AdguardTeam/AdGuardHome","modified":"2026-03-23T04:52:55.207726Z","packages":[{"ecosystem":"Go","name":"github.com/AdguardTeam/AdGuardHome","purl":"pkg:golang/github.com/AdguardTeam/AdGuardHome","ranges":["<0.107.73"],"fixed":["0.107.73"]}]}],"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."]}