File disclosure via unauthenticated bookserver requests
Published Apr 24, 2026 · Updated Apr 24, 2026
Missing authentication in KDE Arianna before 26.04.1 allows remote attackers on the local network to read files exposed by bookserver. The bookserver socket serves files to the application itself but accepts requests for guessed file URLs without first validating an authentication token. Arianna must be running and the attacker must reach its local-network socket; the demonstrated consequence is read-only disclosure of files made available through that service.
Summary
What happened
Missing authentication in KDE Arianna before 26.04.1 allows remote attackers on the local network to read files exposed by bookserver. The bookserver socket serves files to the application itself but accepts requests for guessed file URLs without first validating an authentication token. Arianna must be running and the attacker must reach its local-network socket; the demonstrated consequence is read-only disclosure of files made available through that service.
The record
- CVE
- CVE-2026-42095
- Published
- Apr 24, 2026
- Updated
- Apr 24, 2026
- Vendor
- KDE
- Product
- Arianna
- Classifications
- CWE-306, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 24, 2026CVE publishedPublication date reported by the CVE source.
- Apr 24, 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=0 <26.04.1
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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