CVE-2026-81735

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-27. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 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.

startServer.ts in the mcp-http-server package of UI-TARS-desktop defaulted its listen address to '::' when no host was given, so startSseAndStreamableHttpMcpServer bound the Streamable HTTP and SSE MCP transports to every interface, and its authentication middleware was optional: middlewares are applied only when a caller supplies them. The @agent-infra/mcp-server-commands and @agent-infra/mcp-server-filesystem entry points call startSseAndStreamableHttpMcpServer with a host and port alone and pass no middleware, so neither server required a credential. The commands server exposes a run_command tool that hands its caller-supplied command string to promisify(child_process.exec), so any unauthenticated client able to reach the port could run arbitrary commands as the user running the server, and the filesystem server exposed its file read and write tools on the same terms. The listen default became 127.0.0.1 in commit c2ad42e3eb9b27830db41a3e6f51ca7179d9b168; the package version stayed at 1.2.4 across that change, so the boundary is the commit rather than a release.

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
44%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 31, 2026

Advisory Details (5)

Auto-updated Sep 14, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

UI-TARS-desktop @agent-infra MCP Servers Bind Every Interface Without Authentication, Exposing Arbitrary Command Execution | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ui-tars-desktop-agent-infra-mcp-servers-bind-every-interface-without-authentication-exposing-arbitrary-command-execution
github_pr

fix(mcp-http-server): default host to 127.0.0.1, not all interfaces

Fix merged in bytedance/UI-TARS-desktop PR #1918 on 2026-07-01 — awaiting tagged release

https://github.com/bytedance/UI-TARS-desktop/pull/1918
github_commit

commit c2ad42e3eb9b (bytedance/UI-TARS-desktop)

Fix landed in bytedance/UI-TARS-desktop commit c2ad42e3eb9b — awaiting tagged release

https://github.com/bytedance/UI-TARS-desktop/commit/c2ad42e3eb9b27830db41a3e6f51ca7179d9b168
generic

UI-TARS-desktop/packages/agent-infra/mcp-http-server/src/startServer.ts at e9f3387288da4af2ad99972da2ac916cdabce093 · bytedance/UI-TARS-desktop · GitHub

https://github.com/bytedance/UI-TARS-desktop/blob/e9f3387288da4af2ad99972da2ac916cdabce093/packages/agent-infra/mcp-http-server/src/startServer.ts#L263
generic

GitHub - bytedance/UI-TARS-desktop: The Open-Source Multimodal AI Agent Stack: Connecting Cutting-Edge AI Models and Agent Infra · GitHub

https://github.com/bytedance/UI-TARS-desktop

Vendor Advisories for CVE-2026-81735(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 57× in last 7d / 198× 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 198 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-81735?
CVE-2026-81735 is a critical vulnerability published on August 27, 2026. startServer.ts in the mcp-http-server package of UI-TARS-desktop defaulted its listen address to '::' when no host was given, so startSseAndStreamableHttpMcpServer bound the Streamable HTTP and SSE MCP transports to every interface, and its authentication middleware was optional: middlewares are…
When was CVE-2026-81735 disclosed?
CVE-2026-81735 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81735 actively exploited?
CVE-2026-81735 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 56.0% of all scored CVEs.
What is the CVSS score of CVE-2026-81735?
CVE-2026-81735 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-81735?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81735, 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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