CVE-2026-54449

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-15. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

LangBot is a global IM bot platform designed for LLMs. In version 4.10.7 and earlier, any authenticated user can add or change an STDIO MCP server configuration without an adequate authorization boundary. In src/langbot/pkg/provider/tools/loaders/mcp.py, StdioServerParameters accepts the configured command and arguments and starts a server-side subprocess on the LangBot server. An attacker who can sign up or obtain an account can use the Extensions MCP configuration to execute arbitrary commands with the privileges of the LangBot service, enabling data disclosure, modification, and service disruption. No fixed version is available as of this review.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

July 15, 2026

Last Modified

August 21, 2026

Advisory Details (2)

Auto-updated Aug 20, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

MCP STDIO Command Injection: Full Vulnerability Advisory

https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem
github Patch Available🟡 PoC Available

Authenticated RCE Via MCP Configuration · Advisory · langbot-app/LangBot · GitHub

https://github.com/langbot-app/LangBot/security/advisories/GHSA-3pvh-63gf-j9mw

Vendor Advisories for CVE-2026-54449(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
piplangbot—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
langbot4.1.0 ... 4.9.7 (43 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 78× 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 03:51 UTCEG score recompute
  2. 2026-08-30 03:51 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-28 02:27 UTCEG score recompute
  6. 2026-08-28 02:27 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 14:09 UTCGHSA enrichment
  9. 2026-08-27 01:55 UTCEG score recompute
  10. 2026-08-27 01:55 UTCGHSA enrichment
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-26 13:42 UTCGHSA enrichment
  13. 2026-08-26 00:59 UTCEG score recompute
  14. 2026-08-26 00:59 UTCGHSA enrichment
  15. 2026-08-25 13:49 UTCEPSS rescore
  16. 2026-08-25 11:58 UTCGHSA enrichment
  17. 2026-08-24 23:45 UTCEG score recompute
  18. 2026-08-24 23:45 UTCGHSA enrichment
  19. 2026-08-24 11:32 UTCEG score recompute
  20. 2026-08-24 11:32 UTCGHSA enrichment
  21. 2026-08-23 23:19 UTCGHSA enrichment
  22. 2026-08-23 11:06 UTCEG score recompute
  23. 2026-08-23 11:06 UTCGHSA enrichment
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-22 22:53 UTCGHSA enrichment
Show 72 more
  1. 2026-08-22 10:40 UTCEG score recompute
  2. 2026-08-22 10:40 UTCGHSA enrichment
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-21 22:27 UTCEG score recompute
  5. 2026-08-21 22:27 UTCGHSA enrichment
  6. 2026-08-21 22:01 UTCEG score recompute
  7. 2026-08-21 22:01 UTCGHSA enrichment
  8. 2026-08-21 18:03 UTCGHSA enrichment
  9. 2026-08-21 05:49 UTCGHSA enrichment
  10. 2026-08-20 17:35 UTCEG score recompute
  11. 2026-08-20 17:35 UTCGHSA enrichment
  12. 2026-08-20 16:17 UTCGHSA enrichment
  13. 2026-08-20 12:28 UTCGHSA enrichment
  14. 2026-08-20 00:15 UTCGHSA enrichment
  15. 2026-08-19 10:30 UTCGHSA enrichment
  16. 2026-08-18 22:17 UTCGHSA enrichment
  17. 2026-08-18 09:59 UTCGHSA enrichment
  18. 2026-08-17 21:38 UTCGHSA enrichment
  19. 2026-08-17 09:21 UTCGHSA enrichment
  20. 2026-08-16 21:09 UTCGHSA enrichment
  21. 2026-08-16 08:55 UTCGHSA enrichment
  22. 2026-08-15 20:42 UTCGHSA enrichment
  23. 2026-08-15 08:29 UTCGHSA enrichment
  24. 2026-08-14 20:15 UTCEG score recompute
  25. 2026-08-14 20:15 UTCGHSA enrichment
  26. 2026-08-14 08:02 UTCGHSA enrichment
  27. 2026-08-13 19:49 UTCGHSA enrichment
  28. 2026-08-13 07:36 UTCGHSA enrichment
  29. 2026-08-12 19:22 UTCGHSA enrichment
  30. 2026-08-12 07:09 UTCGHSA enrichment
  31. 2026-08-11 18:56 UTCGHSA enrichment
  32. 2026-08-11 06:43 UTCGHSA enrichment
  33. 2026-08-10 18:30 UTCGHSA enrichment
  34. 2026-08-10 06:16 UTCGHSA enrichment
  35. 2026-08-09 18:03 UTCGHSA enrichment
  36. 2026-08-09 05:51 UTCGHSA enrichment
  37. 2026-08-08 17:38 UTCGHSA enrichment
  38. 2026-08-08 05:25 UTCGHSA enrichment
  39. 2026-08-07 17:12 UTCGHSA enrichment
  40. 2026-08-07 04:59 UTCGHSA enrichment
  41. 2026-08-06 16:46 UTCGHSA enrichment
  42. 2026-08-06 04:33 UTCGHSA enrichment
  43. 2026-08-05 16:20 UTCGHSA enrichment
  44. 2026-08-05 04:07 UTCGHSA enrichment
  45. 2026-08-04 15:52 UTCGHSA enrichment
  46. 2026-08-04 03:39 UTCGHSA enrichment
  47. 2026-08-03 15:26 UTCGHSA enrichment
  48. 2026-08-03 03:13 UTCGHSA enrichment
  49. 2026-08-02 14:59 UTCGHSA enrichment
  50. 2026-08-02 02:46 UTCGHSA enrichment
  51. 2026-08-01 14:33 UTCGHSA enrichment
  52. 2026-08-01 02:20 UTCGHSA enrichment
  53. 2026-07-31 14:06 UTCGHSA enrichment
  54. 2026-07-31 01:51 UTCGHSA enrichment
  55. 2026-07-31 01:48 UTCGHSA enrichment
  56. 2026-07-30 13:34 UTCEG score recompute
  57. 2026-07-30 13:34 UTCGHSA enrichment
  58. 2026-07-30 01:21 UTCGHSA enrichment
  59. 2026-07-29 13:06 UTCGHSA enrichment
  60. 2026-07-29 00:53 UTCGHSA enrichment
  61. 2026-07-28 12:38 UTCGHSA enrichment
  62. 2026-07-28 00:24 UTCGHSA enrichment
  63. 2026-07-27 11:59 UTCGHSA enrichment
  64. 2026-07-26 23:46 UTCGHSA enrichment
  65. 2026-07-26 11:33 UTCEG score recompute
  66. 2026-07-26 11:32 UTCGHSA enrichment
  67. 2026-07-23 03:19 UTCEG score recompute
  68. 2026-07-17 06:36 UTCGHSA enrichment
  69. 2026-07-16 18:23 UTCGHSA enrichment
  70. 2026-07-16 06:07 UTCGHSA enrichment
  71. 2026-07-15 17:54 UTCEG score recompute
  72. 2026-07-15 17:54 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54449?
CVE-2026-54449 is a high vulnerability published on July 15, 2026. LangBot is a global IM bot platform designed for LLMs. In version 4.10.7 and earlier, any authenticated user can add or change an STDIO MCP server configuration without an adequate authorization boundary. In src/langbot/pkg/provider/tools/loaders/mcp.py, StdioServerParameters accepts the configured…
When was CVE-2026-54449 disclosed?
CVE-2026-54449 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54449 actively exploited?
CVE-2026-54449 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 66.1% of all scored CVEs.
What is the CVSS score of CVE-2026-54449?
CVE-2026-54449 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-54449?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54449, 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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