CVE-2026-84810 Details
Description
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.
A vulnerability in Claude Skill Antivirus versions through 2.1.3 allows malicious code execution by failing to properly analyze executable files in local skill directories. The scanner only reads the SKILL.md manifest file, ignoring Python source files, bytecode, and other artifacts in the scripts directory. As a result, skills containing harmful code in non-manifest files can receive a false sense of security, being marked as SAFE with a perfect trust score, while actually harboring unanalyzed executable payloads.
Users can manually review skills flagged by Claude Skill Antivirus as SAFE, especially those with a high trust score, to ensure they do not contain unexamined executable code.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 2, 2026CISA-ADP
Assessed Sep 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nedlir/skills-scanner-bypass | CISA-ADP | Exploit |
| https://github.com/claude-world/claude-skill-antivirus | [email protected] | Vendor |
| https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/scanner/index.js | [email protected] | Source CodeVendor |
| https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/utils/downloader.js | [email protected] | Source CodeVendor |
| https://github.com/claude-world/claude-skill-antivirus/issues/33 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/claude-skill-antivirus-analysis-bypass-via-manifest-only-local-directory-scan | [email protected] | AdvisoryVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-693 | Protection Mechanism Failure | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| claude-world/claude-skill-antivirus | <= 2.1.3 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 2, 2026 | CVE Modified | CISA-ADP |
| Sep 2, 2026 | New CVE Received | [email protected] |