CVE-2026-19243 (GCVE-0-2026-19243)
Vulnerability from cvelistv5 – Published: 2026-08-07 19:30 – Updated: 2026-08-11 01:10
VLAI
EPSS
VEX
Title
HKUDS nanobot Shell Allowlist shell.py ExecTool._spawn os command injection
Summary
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 01:10 UTC
Assigner
References
13 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/386997 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/386997/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-19243 | third-party-advisory |
| https://vuldb.com/submit/865112 | third-party-advisory |
| https://vuldb.com/submit/865114 | third-party-advisory |
| https://vuldb.com/submit/865115 | third-party-advisory |
| https://vuldb.com/submit/865119 | third-party-advisory |
| https://vuldb.com/submit/865121 | third-party-advisory |
| https://github.com/HKUDS/nanobot/issues/4521 | issue-tracking |
| https://gist.github.com/YLChen-007/8fcbf8e49e7be5… | exploit |
| https://github.com/HKUDS/nanobot/pull/4562 | issue-trackingpatch |
| https://github.com/HKUDS/nanobot/releases/tag/v0.3.0 | patch |
| https://github.com/HKUDS/nanobot/ | product |
Impacted products
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"name": "Submit #865112 | HKUDS nanobot 0.2.1 OS Command Injection via Allowlist Bypass (CWE-78)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/865112"
},
{
"name": "Submit #865114 | HKUDS nanobot 0.2.1 Command Injection via Comment-Tail Allowlist Bypass (CWE-88) (Duplicate)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/865114"
},
{
"name": "Submit #865115 | HKUDS nanobot 0.2.1 Allowlist Bypass via Wrapper Prefix (CWE-184) (Duplicate)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/865115"
},
{
"name": "Submit #865119 | HKUDS nanobot 0.2.1 Allowlist Bypass Leading to Command Execution (CWE-184) (Duplicate)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/865119"
},
{
"name": "Submit #865121 | HKUDS nanobot 0.2.1 Command Injection via Shell-Chain Allowlist Bypass (CWE-88) (Duplicate)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/865121"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/HKUDS/nanobot/issues/4521"
},
{
"tags": [
"exploit"
],
"url": "https://gist.github.com/YLChen-007/8fcbf8e49e7be568e1a92e9e0414fdba"
},
{
"tags": [
"issue-tracking",
"patch"
],
"url": "https://github.com/HKUDS/nanobot/pull/4562"
},
{
"tags": [
"patch"
],
"url": "https://github.com/HKUDS/nanobot/releases/tag/v0.3.0"
},
{
"tags": [
"product"
],
"url": "https://github.com/HKUDS/nanobot/"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-08-07T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
"lang": "en",
"time": "2026-08-07T02:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-08-07T14:12:07.000Z",
"value": "VulDB entry last update"
}
],
"title": "HKUDS nanobot Shell Allowlist shell.py ExecTool._spawn os command injection",
"x_generator": [
"VulDB PVTS v202608"
]
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2026-19243",
"datePublished": "2026-08-07T19:30:13.316Z",
"dateReserved": "2026-08-07T12:06:59.355Z",
"dateUpdated": "2026-08-11T01:10:10.998Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.