CVE-2026-19243

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-08-07. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 6.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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".

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
74%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Aug 7, 2026
No patch confirmed yet.
generic

nanobot: `tools.exec.allowPatterns` whitelist bypass leads to shell command execution via chained commands · GitHub

https://gist.github.com/YLChen-007/8fcbf8e49e7be568e1a92e9e0414fdba
generic

[Security] `exec.allowPatterns` shell-chain bypass allows unintended command execution · Issue #4521 · HKUDS/nanobot · GitHub

https://github.com/HKUDS/nanobot/issues/4521

Vendor Advisories for CVE-2026-19243(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 21:49 UTCGHSA enrichment
  3. 2026-08-19 21:45 UTCEG score recompute
  4. 2026-08-19 21:45 UTCGHSA enrichment
  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 21:41 UTCEG score recompute
  7. 2026-08-18 21:40 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 21:25 UTCEG score recompute
  10. 2026-08-17 21:25 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 21:21 UTCEG score recompute
  13. 2026-08-16 21:21 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 21:17 UTCEG score recompute
  17. 2026-08-15 21:17 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 21:12 UTCEG score recompute
  20. 2026-08-14 21:12 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 21:08 UTCGHSA enrichment
  23. 2026-08-12 21:04 UTCEG score recompute
  24. 2026-08-12 21:04 UTCGHSA enrichment
  25. 2026-08-12 13:50 UTCEPSS rescore
Show 21 more
  1. 2026-08-12 02:26 UTCEG score recompute
  2. 2026-08-12 02:26 UTCGHSA enrichment
  3. 2026-08-11 13:42 UTCEPSS rescore
  4. 2026-08-11 02:22 UTCEG score recompute
  5. 2026-08-11 02:22 UTCGHSA enrichment
  6. 2026-08-11 02:22 UTCNVD updateCVSS v4 → 2.1
  7. 2026-08-11 01:28 UTCEG score recompute
  8. 2026-08-11 01:28 UTCGHSA enrichment
  9. 2026-08-11 01:28 UTCMITRE cvelistV5CVSS v4 → 5.3
  10. 2026-08-11 00:00 UTCEPSS rescore
  11. 2026-08-10 20:42 UTCGHSA enrichment
  12. 2026-08-09 20:38 UTCEG score recompute
  13. 2026-08-09 20:38 UTCGHSA enrichment
  14. 2026-08-09 13:46 UTCEPSS rescore
  15. 2026-08-08 20:34 UTCEG score recompute
  16. 2026-08-08 20:34 UTCGHSA enrichment
  17. 2026-08-08 16:37 UTCEPSS rescore
  18. 2026-08-07 20:30 UTCEG score recompute
  19. 2026-08-07 20:30 UTCNVD updateCVSS v4 → 2.1
  20. 2026-08-07 19:37 UTCEG score recompute
  21. 2026-08-07 19:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-19243?
CVE-2026-19243 is a medium vulnerability published on August 7, 2026. A security vulnerability has been detected in HKUDS nanobot up to 0.2.1. Impacted is the function ExecTool.guardcommand/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…
When was CVE-2026-19243 disclosed?
CVE-2026-19243 was first published in the National Vulnerability Database on August 7, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19243 actively exploited?
CVE-2026-19243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 26.0% of all scored CVEs.
What is the CVSS score of CVE-2026-19243?
CVE-2026-19243 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-19243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19243, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-19243

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