CVE-2026-33727: Pi-hole is a Linux network-level advertisement and Internet tracker blocking application

Routine

MEDIUM 6.4WATCHLISTDOWNGRADE

CVE-2026-33727 is a medium-severity flaw (CVSS 6.4) affecting pi-hole. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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-com

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-269
Published	2026-04-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: pi-hole

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-06 16:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

pi-hole pi-hole DOWNGRADE

Affected: 6.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.4

1. Check installed version

apt-cache policy pi-hole || rpm -q pi-hole || pi-hole --version

2. No fixed release: DOWNGRADE to a release before 6.4 (Debian / Ubuntu)

apt-cache madison pi-hole sudo apt install pi-hole=<VERSION_BEFORE_6.4> sudo apt-mark hold pi-hole

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pi-hole sudo dnf downgrade pi-hole-<VERSION_BEFORE_6.4> sudo dnf versionlock add pi-hole

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33727?

pi-hole: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-33727 being exploited?

CVE-2026-33727 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33727 affect?

CVE-2026-33727 affects pi-hole. Severity is medium (CVSS 6.4). 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

How urgent is CVE-2026-33727?

Priority 30/100. On your watchlist

Related CVEs

CVE-2026-50130 HIGH 8.8 UPGRADE Pi-hole is a DNS sinkhole that protects devices from unwanted content without installing any client-side softw

References

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