What is the CVSS score of EUVD-2026-25566?

EUVD-2026-25566 has a CVSS 3.1 base score of 4.0 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Is there a patch available for EUVD-2026-25566?

Yes, a patch is available for EUVD-2026-25566. Update the affected software to the latest version immediately.

KDE Arianna EUVD-2026-25566

| CVE-2026-42095 MEDIUM

Missing Authentication for Critical Function (CWE-306)

2026-04-24 mitre

GHSA-7824-f4f9-2x77

Authentication Bypass Suse

4.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.0 MEDIUM

AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SUSE

3.1 LOW

AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Apr 24, 2026 - 17:55 nvd

Patch available

Apr 24, 2026 - 16:16 EUVD

Analysis Generated

Apr 24, 2026 - 15:00 vuln.today

EUVD ID Assigned

Apr 24, 2026 - 14:30 euvd

EUVD-2026-25566

Analysis Generated

Apr 24, 2026 - 14:30 vuln.today

CVE Published

Apr 24, 2026 - 00:00 nvd

MEDIUM 4.0

DescriptionCVE.org

bookserver in KDE Arianna before 26.04.1 allows attackers to read files over a socket connection by guessing a URL.

AnalysisAI

KDE Arianna's bookserver before version 26.04.1 allows local attackers to read arbitrary files over socket connections by guessing URLs without authentication, exploiting missing input validation on the bookserver endpoint. The vulnerability requires local access and does not affect confidentiality of other system components; no public exploit code or active exploitation has been identified.

Technical ContextAI

KDE Arianna's bookserver component exposes a socket-based interface for book content retrieval. The vulnerability stems from CWE-306 (Missing Authentication Check), where the socket listener fails to validate or authenticate requested URLs before serving file content. An attacker with local system access can directly connect to the bookserver socket and craft arbitrary file paths without needing valid credentials or authorization tokens, bypassing the authentication mechanism entirely. The socket-based architecture creates a local attack surface distinct from network-facing vulnerabilities.

RemediationAI

Upgrade KDE Arianna to version 26.04.1 or later; this is the primary vendor-released patch addressing the authentication bypass. Users unable to upgrade immediately should restrict local access to systems running Arianna where possible-disable multi-user login on shared machines or isolate Arianna to dedicated user accounts with minimal system privileges. Consider running Arianna in a confined environment (e.g., namespace/container) if it must coexist with untrusted local users. The socket-based bookserver can be disabled entirely if Arianna's offline book features are not required, eliminating the attack surface, though this removes core functionality. Patch availability is confirmed via KDE's official advisory (kde.org/info/security/advisory-20260424-1.txt) and upstream commits on the KDE GitLab instance.