CVE-2026-55604

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

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

DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global SessionStore accepts caller-supplied session_id values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via deepseek_sessions, then reuse a victim-controlled session_id in deepseek_chat to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Jul 9, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_release.
github_release Patch Available

v1.7.0 — Security: HTTP transport session isolation

Patch available: arikusi/deepseek-mcp-server v1.7.0

https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0
github Patch Available🟡 PoC Available

Authorization Bypass Through User-Controlled Key in @arikusi/deepseek-mcp-server · Advisory · arikusi/deepseek-mcp-server · GitHub

https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578

Vendor Advisories for CVE-2026-55604(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@arikusi/deepseek-mcp-server—1.7.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 36× 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 111 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-55604?
CVE-2026-55604 is a high vulnerability published on July 9, 2026. DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global SessionStore accepts caller-supplied sessionid values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs…
When was CVE-2026-55604 disclosed?
CVE-2026-55604 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55604 actively exploited?
CVE-2026-55604 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 68.9% of all scored CVEs.
What is the CVSS score of CVE-2026-55604?
CVE-2026-55604 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-55604?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55604, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55604

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