How severe is CVE-2026-33727?

CVE-2026-33727 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33727 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33727?

CVE-2026-33727 affects Pi-hole. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33727?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33727 have an EU (EUVD) identifier?

Yes. CVE-2026-33727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19291.

When was CVE-2026-33727 published?

CVE-2026-33727 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-33727

CVE-2026-33727 is a medium-severity vulnerability in Pi-hole with a CVSS 3.x base score of 6.4. 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-269.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19291
Weakness: CWE-269
Affected product: Pi-hole
Published: 2026-04-06
Last modified: 2026-06-17

Description

Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. Version 6.4 has a local privilege-escalation vulnerability allows code execution as root from the low-privilege pihole account. Important context: the pihole account uses nologin, so this is not a direct interactive-login issue. However, nologin does not prevent code from running as UID pihole if a Pi-hole component is compromised. In that realistic post-compromise scenario, attacker-controlled content in /etc/pihole/versions is sourced by root-run Pi-hole scripts, leading to root code execution. This vulnerability is fixed in 6.4.1.

Frequently asked questions

What is CVE-2026-33727?: Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. Version 6.4 has a local privilege-escalation vulnerability allows code execution as root from the low-privilege pihole account. Important context: the pihole account uses nologin, so this is not a direct interactive-login issue. However, nologin does not prevent code from running as UID pihole if a Pi-hole component is compromised. In that realistic post-compromise scenario, attacker-controlled content in /etc/pihole/versions is sourced by root-run Pi-hole scripts, leading to root code execution. This vulnerability is fixed in 6.4.1.
How severe is CVE-2026-33727?: CVE-2026-33727 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33727 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33727?: CVE-2026-33727 affects Pi-hole. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33727?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33727 have an EU (EUVD) identifier?: Yes. CVE-2026-33727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19291.
When was CVE-2026-33727 published?: CVE-2026-33727 was published on 2026-04-06 and last updated on 2026-06-17.

References

https://github.com/pi-hole/pi-hole/security/advisories/GHSA-c935-8g63-qp74

Affected products (1)

cpe:2.3:a:pi-hole:pi-hole:6.4:*:*:*:*:*:*:*

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