CVE-2026-19243: Software Security Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-m259-67hc-p7v5
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CVSS 6.3
CWE-77
Published
Advisory Summary

CVE-2026-19243 is a LOW (CVSS 6.3) security vulnerability vulnerability (CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-19243 at a Glance

CVE Identifier CVE-2026-19243
GHSA Identifier GHSA-m259-67hc-p7v5
Severity LOW
CVSS v3.1 Base Score 6.3
CWE Classification CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.3

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

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

How to Fix CVE-2026-19243

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-2026-19243, 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-77: Improper Neutralization of Special Elements used in a Command ('Command Injection'), where the product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. 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

A security vulnerability has been detected in HKUDS nanobot up to 0.2.1. Impacted is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component Shell Allowlist Handler. Such manipulation leads to os command injection. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 0.3.0 is recommended to address this issue. The name of the patch is 4562. It is advisable to upgrade the affected component. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: "These five reports are variants of the same root cause: validation of shell commands containing multiple segments, wrappers, comments, or chained commands. The issue was fixed by validating every executable shell segment against the configured allowlist".

References

NVD — CVE-2026-19243 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19243
Software Source Repository REPOSITORY
https://github.com/HKUDS/nanobot/issues/4521
Software Source Repository REPOSITORY
https://github.com/HKUDS/nanobot/pull/4562
Software Source Repository REPOSITORY
https://gist.github.com/YLChen-007/8fcbf8e49e7be568e1a92e9e0414fdba
Software Source Repository REPOSITORY
https://github.com/HKUDS/nanobot
Software Release RELEASE
https://github.com/HKUDS/nanobot/releases/tag/v0.3.0
vuldb.com/cve/cve-2026-19243 WEB
https://vuldb.com/cve/CVE-2026-19243
vuldb.com/submit/865112 WEB
https://vuldb.com/submit/865112
vuldb.com/submit/865114 WEB
https://vuldb.com/submit/865114
vuldb.com/submit/865115 WEB
https://vuldb.com/submit/865115
vuldb.com/submit/865119 WEB
https://vuldb.com/submit/865119
vuldb.com/submit/865121 WEB
https://vuldb.com/submit/865121
vuldb.com/vuln/386997 WEB
https://vuldb.com/vuln/386997
vuldb.com/vuln/386997/cti WEB
https://vuldb.com/vuln/386997/cti

Frequently Asked Questions

What is CVE-2026-19243?
CVE-2026-19243 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-19243?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-19243?
CVE-2026-19243 has a CVSS v3.1 base score of 6.3 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-19243?
CVE-2026-19243 is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') (The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.).
How can I check Maven dependencies for CVE-2026-19243?
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-m259-67hc-p7v5",
  "modified" : "2026-08-07T21:30:38Z",
  "published" : "2026-08-07T21:30:38Z",
  "aliases" : [ "CVE-2026-19243" ],
  "details" : "A security vulnerability has been detected in HKUDS nanobot up to 0.2.1. Impacted is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component Shell Allowlist Handler. Such manipulation leads to os command injection. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 0.3.0 is recommended to address this issue. The name of the patch is 4562. It is advisable to upgrade the affected component. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: \"These five reports are variants of the same root cause: validation of shell commands containing multiple segments, wrappers, comments, or chained commands. The issue was fixed by validating every executable shell segment against the configured allowlist\".",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
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  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-19243"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HKUDS/nanobot/issues/4521"
  }, {
    "type" : "WEB",
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    "url" : "https://github.com/HKUDS/nanobot"
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    "type" : "WEB",
    "url" : "https://github.com/HKUDS/nanobot/releases/tag/v0.3.0"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-19243"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/865112"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/865114"
  }, {
    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/865119"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/865121"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/386997"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/386997/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-77" ],
    "severity" : "LOW",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-07T20:16:50Z"
  }
}