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CVE-2026-32136— AdGuard Home: HTTP/2 Cleartext (h2c) Upgrade Authentication Bypass

Quick assessment

Affected
AdguardTeam AdGuardHome
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Eugene AdGuard Home是 Eugene开源的一个应用软件。提供用于阻止广告和跟踪的全网络软件。 Eugene AdGuard Home 0.107.73之前版本存在授权问题漏洞，该漏洞源于未经验证的远程攻击者可通过发送请求升级到HTTP/2明文连接的请求来绕过所有身份验证，导致后续HTTP/2请求被当作已完全认证处理。

CVSS 9.8 · Critical EPSS 0.78% · P55
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I. Basic Information for CVE-2026-32136

Vulnerability Information
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Vulnerability Title
AdGuard Home: HTTP/2 Cleartext (h2c) Upgrade Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Eugene AdGuard Home 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eugene AdGuard Home是 Eugene开源的一个应用软件。提供用于阻止广告和跟踪的全网络软件。 Eugene AdGuard Home 0.107.73之前版本存在授权问题漏洞，该漏洞源于未经验证的远程攻击者可通过发送请求升级到HTTP/2明文连接的请求来绕过所有身份验证，导致后续HTTP/2请求被当作已完全认证处理。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
AdguardTeam AdGuardHome < 0.107.73 -

II. Public POCs for CVE-2026-32136

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III. Intelligence Information for CVE-2026-32136

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Vendor Advisories for CVE-2026-32136 (1)

IV. Related Vulnerabilities

Same product: AdGuardHome
Same vendor: AdguardTeam
Same weakness: CWE-287

V. Comments for CVE-2026-32136

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