CVE-2026-86121

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-05. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Cua computer-server versions before 0.3.42 skip authentication when the CONTAINER_NAME environment variable is unset and bind to all interfaces by default, allowing unauthenticated attackers to execute arbitrary commands. Attackers can reach TCP port 8000 to run shell commands via the run_command endpoint, read and write arbitrary files through file operation endpoints, and access interactive PTY shells without authentication.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 8, 2026

Advisory Details (6)

Auto-updated Sep 16, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

cua computer-server binds all interfaces and disables authentication by default in local mode (CONTAINER_NAME unset), exposing unauthenticated remote command execution, arbitrary file read/write, and PTY shell · Issue #1892 · trycua/cua · GitHub

https://github.com/trycua/cua/issues/1892
generic

Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cua-computer-server-before-0.3.42-unauthenticated-rce-via-desktop-control
github_commit

commit 59cf25c0ec54 (trycua/cua)

Fix landed in trycua/cua commit 59cf25c0ec54 — awaiting tagged release

https://github.com/trycua/cua/commit/59cf25c0ec54
generic

cua/libs/python/computer-server/computer_server/main.py at 10a2e71792db5cce24a494d72072594c778291e8 · trycua/cua · GitHub

https://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/main.py
generic

cua/libs/python/computer-server/computer_server/cli.py at 10a2e71792db5cce24a494d72072594c778291e8 · trycua/cua · GitHub

https://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/cli.py
generic

GitHub - trycua/cua: Scale computer-use 2.0 with open-source drivers, cross-OS fleets, and benchmarks for training, evaluation, and data generation. · GitHub

https://github.com/trycua/cua

Vendor Advisories for CVE-2026-86121(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 59× in last 7d / 135× 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 135 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86121?
CVE-2026-86121 is a critical vulnerability published on September 5, 2026. Cua computer-server versions before 0.3.42 skip authentication when the CONTAINERNAME environment variable is unset and bind to all interfaces by default, allowing unauthenticated attackers to execute arbitrary commands. Attackers can reach TCP port 8000 to run shell commands via the runcommand…
When was CVE-2026-86121 disclosed?
CVE-2026-86121 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86121 actively exploited?
CVE-2026-86121 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 53.0% of all scored CVEs.
What is the CVSS score of CVE-2026-86121?
CVE-2026-86121 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-86121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86121, 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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