How severe is CVE-2026-32136?

CVE-2026-32136 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-32136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32136?

CVE-2026-32136 affects Adguard Adguardhome. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32136?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-32136 have an EU (EUVD) identifier?

Yes. CVE-2026-32136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11416.

When was CVE-2026-32136 published?

CVE-2026-32136 was published on 2026-03-11 and last updated on 2026-06-17.

CVE-2026-32136

CVE-2026-32136 is a critical-severity vulnerability in Adguard Adguardhome with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11416
Weakness: CWE-287
Affected product: Adguard Adguardhome
Published: 2026-03-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-32136?: 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.
How severe is CVE-2026-32136?: CVE-2026-32136 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-32136 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32136?: CVE-2026-32136 affects Adguard Adguardhome. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32136?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-32136 have an EU (EUVD) identifier?: Yes. CVE-2026-32136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11416.
When was CVE-2026-32136 published?: CVE-2026-32136 was published on 2026-03-11 and last updated on 2026-06-17.

References

https://github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-5fg6-wrq4-w5gh

Affected products (1)

cpe:2.3:a:adguard:adguardhome:*:*:*:*:*:*:*:*

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