CVE-2026-26101

HighLPE

Published: 20 February 2026

Published

20 February 2026

Modified

27 February 2026

KEV Added

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Patch

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CVSS Score v4 8.5 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0011 1.3th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-26101 is a high-severity Incorrect Permission Assignment for Critical Resource (CWE-732) vulnerability in Owlcyberdefense Opds-Talon. Its CVSS base score is 8.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Services File Permissions Weakness (T1574.010); ranked at the 1.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and AC-6 (Least Privilege).

Deeper analysis

CVE-2026-26101, published on 2026-02-20, is an Incorrect Permission Assignment for Critical Resource vulnerability (CWE-732) in Owl opds version 2.2.0.4. This flaw enables file manipulation via a crafted network request due to improper permissions on a critical resource. The CVSS v3.1 base score is 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high severity with local access vector, low attack complexity, and low privileges required.

A local attacker with low privileges (PR:L) can exploit this vulnerability without user interaction by sending a crafted network request. Successful exploitation allows file manipulation on critical resources, resulting in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H).

Mitigation details are provided in the advisory at https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-26101.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-7762

Vulnerability details

Incorrect Permission Assignment for Critical Resource in Owl opds 2.2.0.4 allows File Manipulation via a crafted network request.

CWE(s): CWE-732

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1574.010 Services File Permissions Weakness Stealth

Adversaries may execute their own malicious payloads by hijacking the binaries used by services.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

Incorrect permission assignment (CWE-732) on a critical resource directly enables abuse of file system permissions weakness (T1044) by a low-privileged local attacker; the resulting file manipulation with high C/I/A impact constitutes exploitation of a software vulnerability for privilege escalation (T1068).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0