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Vulnerability record · CVE-2026-84811 · published 2 September 2026

CVE-2026-84811: agentverus-scanner fails to analyze compiled Python bytecode files in companion code directories, allowing att…

agentverus-scanner fails to analyze compiled Python bytecode files in companion code directories, allowing attackers to bypass security scanning by shipping malicious __pycache__ entries alongside benign source files. Attackers can execute arbitrary Python bytecode on import while the scanner reports a CERTIFIED verdict with high trust scores in both static and semantic analysis modes.

7.1 CVSS 4.0 High EPSS 0.52% · top 58.5% CWE-693 · CWE-693 Deferred
7.1CVSS 4.0 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
23 Sep 2026Last modified by NVD

Description

agentverus-scanner fails to analyze compiled Python bytecode files in companion code directories, allowing attackers to bypass security scanning by shipping malicious __pycache__ entries alongside benign source files. Attackers can execute arbitrary Python bytecode on import while the scanner reports a CERTIFIED verdict with high trust scores in both static and semantic analysis modes.

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:

References

LinkTags
https://github.com/agentverus/agentverus-scanner
https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/analyzers/semantic.ts
https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/companion-code.ts
https://github.com/agentverus/agentverus-scanner/issues/27
https://www.vulncheck.com/advisories/agentverus-scanner-companion-code-analysis-bypass-via-excluded-python-bytecode

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Source: NIST National Vulnerability Database (record CVE-2026-84811), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.