CVE-2026-84811: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-7r9q-g8p5-w7pp
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CVSS 6.5
CWE-693
Published
Advisory Summary

CVE-2026-84811 is a HIGH (CVSS 6.5) security vulnerability vulnerability (CWE-693: Protection Mechanism Failure) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-84811 at a Glance

CVE Identifier CVE-2026-84811
GHSA Identifier GHSA-7r9q-g8p5-w7pp
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-693: Protection Mechanism Failure
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-84811

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-84811, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-693: Protection Mechanism Failure, where the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2026-84811 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84811
Software Source Repository REPOSITORY
https://github.com/agentverus/agentverus-scanner/issues/27
Software Source Repository REPOSITORY
https://github.com/agentverus/agentverus-scanner
Software Source Repository REPOSITORY
https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/analyzers/semantic.ts
Software Source Repository REPOSITORY
https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/companion-code.ts
www.vulncheck.com/advisories/agentver... WEB
https://www.vulncheck.com/advisories/agentverus-scanner-companion-code-analysis-bypass-via-excluded-python-bytecode

Frequently Asked Questions

What is CVE-2026-84811?
CVE-2026-84811 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-693: Protection Mechanism Failure.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-84811?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-84811?
CVE-2026-84811 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2026-84811?
CVE-2026-84811 is classified under CWE-693: Protection Mechanism Failure (The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.).
How can I check Maven dependencies for CVE-2026-84811?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7r9q-g8p5-w7pp",
  "modified" : "2026-09-02T18:32:29Z",
  "published" : "2026-09-02T18:32:29Z",
  "aliases" : [ "CVE-2026-84811" ],
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-84811"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/agentverus/agentverus-scanner/issues/27"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/agentverus/agentverus-scanner"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/analyzers/semantic.ts"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/companion-code.ts"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/agentverus-scanner-companion-code-analysis-bypass-via-excluded-python-bytecode"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-693" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-02T17:18:05Z"
  }
}