CVE-2026-18992

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-08-06. 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 weekElevated
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: Elevated riskExposed: 0

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

A vulnerability was detected in zhayujie CowAgent up to 2.1.1. This vulnerability affects the function _select_tools of the file agent/evolution/executor.py of the component Self-Evolution Review Agent. Performing a manipulation results in incorrect authorization. The attack is possible to be carried out remotely. The exploit is now public and may be used.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 12, 2026

Advisory Details (3)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

[Security] Self-Evolution Review Agent in CowAgent Reacquires Restricted MCP Tools During Background Review · Issue #2904 · zhayujie/CowAgent · GitHub

https://github.com/zhayujie/CowAgent/issues/2904#issuecomment-4756833239
generic

[Security] Self-Evolution Review Agent in CowAgent Reacquires Restricted MCP Tools During Background Review · Issue #2904 · zhayujie/CowAgent · GitHub

https://github.com/zhayujie/CowAgent/issues/2904
generic

GitHub - zhayujie/CowAgent: Open-source super AI assistant & Agent Harness. Plans tasks, runs tools and skills, self-evolves with memory and knowledge. Multi-model, multi-channel. Lightweight, extensible, one-line install. (formerly chatgpt-on-wechat) · GitHub

https://github.com/zhayujie/CowAgent/

Vendor Advisories for CVE-2026-18992(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 16× in last 7d / 75× 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.

Showing the most recent 100 of 126 total refreshes for this CVE.

  1. 2026-09-19 21:58 UTCEG score recompute
  2. 2026-09-19 21:58 UTCGHSA enrichment
  3. 2026-09-18 23:32 UTCEG score recompute
  4. 2026-09-18 23:32 UTCGHSA enrichment
  5. 2026-09-18 19:27 UTCEPSS rescore
  6. 2026-09-18 01:04 UTCEG score recompute
  7. 2026-09-18 01:04 UTCGHSA enrichment
  8. 2026-09-17 01:35 UTCEG score recompute
  9. 2026-09-17 01:35 UTCGHSA enrichment
  10. 2026-09-16 14:07 UTCEPSS rescore
  11. 2026-09-16 05:14 UTCEPSS rescore
  12. 2026-09-16 03:09 UTCEG score recompute
  13. 2026-09-16 03:09 UTCGHSA enrichment
  14. 2026-09-15 01:19 UTCGHSA enrichment
  15. 2026-09-13 22:38 UTCEG score recompute
  16. 2026-09-13 22:38 UTCGHSA enrichment
  17. 2026-09-13 16:46 UTCEPSS rescore
  18. 2026-09-13 00:13 UTCEG score recompute
  19. 2026-09-13 00:13 UTCGHSA enrichment
  20. 2026-09-12 15:00 UTCEPSS rescore
  21. 2026-09-12 01:48 UTCEG score recompute
  22. 2026-09-12 01:48 UTCGHSA enrichment
  23. 2026-09-11 14:52 UTCEPSS rescore
  24. 2026-09-11 09:36 UTCEPSS rescore
  25. 2026-09-11 03:22 UTCEG score recompute
Show 75 more
  1. 2026-09-11 03:22 UTCGHSA enrichment
  2. 2026-09-10 09:34 UTCEPSS rescore
  3. 2026-09-10 04:56 UTCGHSA enrichment
  4. 2026-09-09 06:17 UTCEG score recompute
  5. 2026-09-09 06:17 UTCGHSA enrichment
  6. 2026-09-08 22:00 UTCEPSS rescore
  7. 2026-09-07 18:08 UTCEG score recompute
  8. 2026-09-07 18:08 UTCGHSA enrichment
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-06 06:21 UTCEG score recompute
  12. 2026-09-06 06:21 UTCGHSA enrichment
  13. 2026-09-05 07:51 UTCEG score recompute
  14. 2026-09-05 07:51 UTCGHSA enrichment
  15. 2026-09-04 09:25 UTCEG score recompute
  16. 2026-09-04 09:25 UTCGHSA enrichment
  17. 2026-09-04 05:06 UTCEPSS rescore
  18. 2026-09-03 06:36 UTCEG score recompute
  19. 2026-09-03 06:36 UTCGHSA enrichment
  20. 2026-09-02 14:11 UTCEPSS rescore
  21. 2026-09-01 22:06 UTCEG score recompute
  22. 2026-09-01 22:05 UTCGHSA enrichment
  23. 2026-09-01 13:53 UTCEPSS rescore
  24. 2026-09-01 04:39 UTCEPSS rescore
  25. 2026-08-31 22:44 UTCGHSA enrichment
  26. 2026-08-30 19:39 UTCEG score recompute
  27. 2026-08-30 19:39 UTCGHSA enrichment
  28. 2026-08-30 19:17 UTCEPSS rescore
  29. 2026-08-30 01:22 UTCEPSS rescore
  30. 2026-08-29 21:14 UTCEG score recompute
  31. 2026-08-29 21:14 UTCGHSA enrichment
  32. 2026-08-28 21:41 UTCEPSS rescore
  33. 2026-08-27 20:42 UTCEG score recompute
  34. 2026-08-27 20:42 UTCGHSA enrichment
  35. 2026-08-27 14:25 UTCEPSS rescore
  36. 2026-08-26 21:57 UTCEG score recompute
  37. 2026-08-26 21:57 UTCGHSA enrichment
  38. 2026-08-26 14:46 UTCEPSS rescore
  39. 2026-08-25 23:19 UTCEG score recompute
  40. 2026-08-25 23:19 UTCGHSA enrichment
  41. 2026-08-25 13:48 UTCEPSS rescore
  42. 2026-08-25 00:42 UTCEG score recompute
  43. 2026-08-25 00:42 UTCGHSA enrichment
  44. 2026-08-24 02:16 UTCGHSA enrichment
  45. 2026-08-23 03:45 UTCEG score recompute
  46. 2026-08-23 03:45 UTCGHSA enrichment
  47. 2026-08-23 00:19 UTCEPSS rescore
  48. 2026-08-22 05:20 UTCEG score recompute
  49. 2026-08-22 05:20 UTCGHSA enrichment
  50. 2026-08-21 23:49 UTCEPSS rescore
  51. 2026-08-21 06:55 UTCEG score recompute
  52. 2026-08-21 06:55 UTCGHSA enrichment
  53. 2026-08-20 22:55 UTCEPSS rescore
  54. 2026-08-20 08:28 UTCEG score recompute
  55. 2026-08-20 08:28 UTCGHSA enrichment
  56. 2026-08-19 17:03 UTCEPSS rescore
  57. 2026-08-19 10:03 UTCEG score recompute
  58. 2026-08-19 10:03 UTCGHSA enrichment
  59. 2026-08-18 13:48 UTCEPSS rescore
  60. 2026-08-18 11:38 UTCEG score recompute
  61. 2026-08-18 11:38 UTCGHSA enrichment
  62. 2026-08-17 13:47 UTCEPSS rescore
  63. 2026-08-17 13:13 UTCEG score recompute
  64. 2026-08-17 13:13 UTCGHSA enrichment
  65. 2026-08-16 14:56 UTCEPSS rescore
  66. 2026-08-16 14:48 UTCEG score recompute
  67. 2026-08-16 14:48 UTCGHSA enrichment
  68. 2026-08-16 02:14 UTCEPSS rescore
  69. 2026-08-15 16:23 UTCEG score recompute
  70. 2026-08-15 16:23 UTCGHSA enrichment
  71. 2026-08-15 01:30 UTCEPSS rescore
  72. 2026-08-14 17:57 UTCEG score recompute
  73. 2026-08-14 17:57 UTCGHSA enrichment
  74. 2026-08-13 22:00 UTCEPSS rescore
  75. 2026-08-13 19:32 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18992?
CVE-2026-18992 is a medium vulnerability published on August 6, 2026. A vulnerability was detected in zhayujie CowAgent up to 2.1.1. This vulnerability affects the function selecttools of the file agent/evolution/executor.py of the component Self-Evolution Review Agent. Performing a manipulation results in incorrect authorization. The attack is possible to be carried…
When was CVE-2026-18992 disclosed?
CVE-2026-18992 was first published in the National Vulnerability Database on August 6, 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-2026-18992 actively exploited?
CVE-2026-18992 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 88.6% of all scored CVEs.
What is the CVSS score of CVE-2026-18992?
CVE-2026-18992 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-18992?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18992, 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.

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