CVE-2026-81096

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-27. the CNA's CVSS baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 10.0Exploit: None knownExposed: 0

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

ToolUniverse ran caller-supplied Python inside a sandbox that could be escaped, on a server that required no authentication. The executor behind the python_code_executor tool, in python_executor_tool.py, inspected the submitted source for a denied list of attribute names and calls but left the attribute-lookup builtins available and did not stop a dunder attribute reached through a string lookup or through a module already permitted, so a caller could walk from a literal's class to its base and enumerate subclasses to obtain a reference to the process and subprocess modules. A per-call argument also let the caller widen the import allow-list before the inspection ran. The HTTP and MCP servers in http_api_server.py and smcp_server.py bound to every interface with debugging enabled and no authentication, so any caller able to reach the port executed code as the server process. Version 1.3.0 adds bearer-token authentication, defaults the bind address to loopback, and hardens the attribute checks.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity100% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 29, 2026

Advisory Details (3)

Auto-updated Aug 29, 2026
Patch available. Sources: github_pr.
generic

ToolUniverse through 1.2.6 Unauthenticated Remote Code Execution via python_code_executor Sandbox Escape | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tooluniverse-through-1.2.6-unauthenticated-remote-code-execution-via-python-code-executor-sandbox-escape
github_pr Patch Available

Fix unauthenticated RCE in python_code_executor and harden server exposure

Patch available: mims-harvard/ToolUniverse v1.3.0 (PR #251 merged 2026-06-12)

https://github.com/mims-harvard/ToolUniverse/pull/251
generic

GitHub - mims-harvard/ToolUniverse: Democratizing AI scientists with ToolUniverse · GitHub

https://github.com/mims-harvard/ToolUniverse

Vendor Advisories for CVE-2026-81096(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 25× 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. 2026-08-30 03:50 UTCEG score recompute
  2. 2026-08-30 03:50 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 23:51 UTCGHSA enrichment
  5. 2026-08-29 19:53 UTCGHSA enrichment
  6. 2026-08-29 15:55 UTCEG score recompute
  7. 2026-08-29 15:55 UTCGHSA enrichment
  8. 2026-08-29 11:56 UTCGHSA enrichment
  9. 2026-08-29 07:55 UTCGHSA enrichment
  10. 2026-08-29 03:55 UTCGHSA enrichment
  11. 2026-08-28 23:54 UTCEG score recompute
  12. 2026-08-28 23:54 UTCGHSA enrichment
  13. 2026-08-28 21:42 UTCEPSS rescore
  14. 2026-08-28 16:48 UTCGHSA enrichment
  15. 2026-08-28 12:38 UTCGHSA enrichment
  16. 2026-08-28 08:35 UTCGHSA enrichment
  17. 2026-08-28 04:25 UTCGHSA enrichment
  18. 2026-08-28 00:26 UTCGHSA enrichment
  19. 2026-08-27 20:27 UTCEG score recompute
  20. 2026-08-27 20:27 UTCGHSA enrichment
  21. 2026-08-27 20:18 UTCEG score recompute
  22. 2026-08-27 20:18 UTCGHSA enrichment
  23. 2026-08-27 17:27 UTCEG score recompute
  24. 2026-08-27 16:47 UTCEG score recompute
  25. 2026-08-27 16:43 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81096?
CVE-2026-81096 is a critical vulnerability published on August 27, 2026. ToolUniverse ran caller-supplied Python inside a sandbox that could be escaped, on a server that required no authentication. The executor behind the pythoncodeexecutor tool, in pythonexecutortool.py, inspected the submitted source for a denied list of attribute names and calls but left the…
When was CVE-2026-81096 disclosed?
CVE-2026-81096 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81096 actively exploited?
CVE-2026-81096 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.2% of all scored CVEs.
What is the CVSS score of CVE-2026-81096?
CVE-2026-81096 has a CVSS v4.0 base score of 10.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-81096?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81096, 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

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