EUVD-2026-70225
GHSA-gvgj-r6pg-m42w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/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
Attacker delivers malicious skill files remotely with no privileges; victim must run scanner and install skill (UI:R); impact is integrity-only with no confidentiality or availability consequence.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
3DescriptionCVE.org
claude-skill-antivirus fails to analyze executable files when scanning local skill directories, reading only SKILL.md while ignoring Python source, bytecode, and other artifacts in the scripts directory. Attackers can distribute skills with malicious code in non-manifest files that receive a SAFE verdict with 100/100 trust score despite containing unanalyzed executable payloads.
Articles & Coverage 1
AnalysisAI
Incomplete file coverage in claude-skill-antivirus v2.1.3 allows malicious Claude skill packages to bypass security scanning entirely when installed from local directories. The scanner reads only the SKILL.md manifest file, leaving Python source (.py), bytecode (.pyc), and all other executable artifacts in the scripts/ subdirectory completely unanalyzed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to use claude-skill-antivirus in local directory scan mode - the code path that reads only SKILL.md. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.1 (AV:N/AC:L/AT:N/PR:N/UI:P/VI:H) reflects the key dynamic: trivial network delivery with no attacker privileges, passive user interaction (running the scanner and acting on its output), and high integrity impact from subsequent malicious code execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The definitive fix requires claude-skill-antivirus to enumerate and analyze all files in skill directories during local scans, including .py source files, .pyc bytecode, shell scripts, and any other executable artifacts in scripts/ subdirectories. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all installed skills from local directories and immediately halt new local installations until remediation is available. …
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External POC / Exploit Code
Leaving vuln.today