CVE-2026-84810
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.1 HIGHCVSS: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/M
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-693
- Source
- disclosure@vulncheck.com
References
- https://github.com/claude-world/claude-skill-antivirus
- https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/scanner/index.js
- https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/utils/downloader.js
- https://github.com/claude-world/claude-skill-antivirus/issues/33
- https://www.vulncheck.com/advisories/claude-skill-antivirus-analysis-bypass-via-manifest-only-local-directory-scan
- https://github.com/nedlir/skills-scanner-bypass
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.