Unauthenticated session hijacking via shared-buffer race
Published Jun 10, 2026 · Updated Jun 10, 2026
Race condition in Pi-hole FTL 6.0 through 6.6.0 allows remote attackers to hijack administrator sessions via concurrent API requests. The HTTP authentication layer writes an administrator SID into the unsynchronized global pi_hole_extra_headers buffer, which another CivetWeb worker can read into its response. Exploitation requires local-network access, concurrent requests, and an active administrator session; a captured SID grants administrative configuration and network-data access.
Summary
What happened
Race condition in Pi-hole FTL 6.0 through 6.6.0 allows remote attackers to hijack administrator sessions via concurrent API requests. The HTTP authentication layer writes an administrator SID into the unsynchronized global pi_hole_extra_headers buffer, which another CivetWeb worker can read into its response. Exploitation requires local-network access, concurrent requests, and an active administrator session; a captured SID grants administrative configuration and network-data access.
The record
- CVE
- CVE-2026-44693
- Published
- Jun 10, 2026
- Updated
- Jun 10, 2026
- Vendor
- Pi-hole
- Product
- Pi-hole FTL
- Classifications
- CWE-362, T1539
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 10, 2026CVE publishedPublication date reported by the CVE source.
- Jun 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 6.6.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- poc_session_race_min.pyproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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