CVE-2026-84809

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

Tencent AI-Infra-Guard's skill-scan component excludes compiled Python bytecode files from analysis by hardcoding __pycache__ directories and .pyc/.pyo/.pyd extensions into skip lists across multiple scanning surfaces. Attackers can distribute skills with benign Python source files alongside malicious compiled bytecode that executes on import while the scanner reports a safe verdict, enabling code execution when operators install the skill.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 4, 2026

Advisory Details (6)

Auto-updated Sep 2, 2026
Patch available. Sources: github_commit.
generic

Tencent AI-Infra-Guard skill-scan Analysis Bypass via Excluded Python Bytecode | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tencent-ai-infra-guard-skill-scan-analysis-bypass-via-excluded-python-bytecode
generic

GitHub - Tencent/AI-Infra-Guard: A full-stack AI Red Teaming platform securing AI ecosystems via Agent Scan, Skills Scan, MCP scan, AI Infra scan and LLM jailbreak evaluation. · GitHub

https://github.com/Tencent/AI-Infra-Guard
generic

AI-Infra-Guard/skill-scan/skill_scan/utils/pre_scan.py at v4.6.0 · Tencent/AI-Infra-Guard · GitHub

https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/utils/pre_scan.py
generic

AI-Infra-Guard/skill-scan/skill_scan/tools/dir/dir_actions.py at v4.6.0 · Tencent/AI-Infra-Guard · GitHub

https://github.com/Tencent/AI-Infra-Guard/blob/v4.6.0/skill-scan/skill_scan/tools/dir/dir_actions.py
github_commit Patch Available

commit 7e0f749e3c02 (Tencent/AI-Infra-Guard)

Patch available: Tencent/AI-Infra-Guard v4.5.2 (contains commit 7e0f749e3c02)

https://github.com/Tencent/AI-Infra-Guard/commit/7e0f749e3c023e5c6ab7b32fe97b3f6f2e8aeb04
generic

[SECURITY] __pycache__ and .pyc files hidden from LLM agent tools (v4.5.1) (malicious skill bypasses this scanner) · Issue #531 · Tencent/AI-Infra-Guard · GitHub

https://github.com/Tencent/AI-Infra-Guard/issues/531

Vendor Advisories for CVE-2026-84809(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 20× in last 7d / 50× 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. 2026-09-19 23:26 UTCEG score recompute
  2. 2026-09-19 23:26 UTCGHSA enrichment
  3. 2026-09-18 22:10 UTCEG score recompute
  4. 2026-09-18 22:10 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-17 20:54 UTCEG score recompute
  7. 2026-09-17 20:54 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-16 19:38 UTCEG score recompute
  10. 2026-09-16 19:38 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 18:20 UTCEG score recompute
  14. 2026-09-15 18:20 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 16:43 UTCEG score recompute
  18. 2026-09-14 16:43 UTCGHSA enrichment
  19. 2026-09-13 15:27 UTCEG score recompute
  20. 2026-09-13 15:27 UTCGHSA enrichment
  21. 2026-09-12 14:10 UTCEG score recompute
  22. 2026-09-12 14:10 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 12:54 UTCEG score recompute
Show 25 more
  1. 2026-09-11 12:53 UTCGHSA enrichment
  2. 2026-09-10 11:26 UTCEG score recompute
  3. 2026-09-10 11:26 UTCGHSA enrichment
  4. 2026-09-09 09:46 UTCEG score recompute
  5. 2026-09-09 09:46 UTCGHSA enrichment
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-08 08:29 UTCGHSA enrichment
  8. 2026-09-07 07:13 UTCEG score recompute
  9. 2026-09-07 07:13 UTCGHSA enrichment
  10. 2026-09-06 13:48 UTCEPSS rescore
  11. 2026-09-06 05:55 UTCEG score recompute
  12. 2026-09-06 05:55 UTCGHSA enrichment
  13. 2026-09-05 15:31 UTCEPSS rescore
  14. 2026-09-05 04:39 UTCEG score recompute
  15. 2026-09-05 04:39 UTCGHSA enrichment
  16. 2026-09-04 05:07 UTCEPSS rescore
  17. 2026-09-04 03:23 UTCEG score recompute
  18. 2026-09-04 03:23 UTCGHSA enrichment
  19. 2026-09-04 02:56 UTCEG score recompute
  20. 2026-09-04 02:55 UTCGHSA enrichment
  21. 2026-09-03 18:54 UTCEG score recompute
  22. 2026-09-03 18:54 UTCGHSA enrichment
  23. 2026-09-02 17:35 UTCEG score recompute
  24. 2026-09-02 17:03 UTCEG score recompute
  25. 2026-09-02 17:01 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84809?
CVE-2026-84809 is a medium vulnerability published on September 2, 2026. Tencent AI-Infra-Guard's skill-scan component excludes compiled Python bytecode files from analysis by hardcoding pycache directories and .pyc/.pyo/.pyd extensions into skip lists across multiple scanning surfaces. Attackers can distribute skills with benign Python source files alongside malicious…
When was CVE-2026-84809 disclosed?
CVE-2026-84809 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84809 actively exploited?
CVE-2026-84809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.3% of all scored CVEs.
What is the CVSS score of CVE-2026-84809?
CVE-2026-84809 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-84809?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84809, 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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