CVE-2026-31309

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: cisa-adp, epss, ghsa
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: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a crafted POST request.

CVSS v3
9.8
EG Score
9.8(medium)
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
0%
EPSS %ILE
36%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 16, 2026

Advisory Details (6)

Auto-updated Jul 25, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GitHub - Sch8ill/CVE-2026-31309: Improper Access Control in Mysterium Node before v1.36.0 · GitHub

https://github.com/sch8ill/CVE-2026-31309
github_commit

commit bc099fcaff59 (mysteriumnetwork/node)

Fix landed in mysteriumnetwork/node commit bc099fcaff59 — awaiting tagged release

https://github.com/mysteriumnetwork/node/commit/bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9
generic

GitHub - mysteriumnetwork/node: Mysterium Network Node - official implementation of distributed VPN network (dVPN) protocol · GitHub

https://github.com/mysteriumnetwork/node/
github_release Patch Available

1.35.5

Patch available: mysteriumnetwork/node 1.35.5 (pre-release)

https://github.com/mysteriumnetwork/node/releases/tag/1.35.5
github_commit

commit 83051199cd64 (mysteriumnetwork/node)

Fix landed in mysteriumnetwork/node commit 83051199cd64 — awaiting tagged release

https://github.com/mysteriumnetwork/node/commit/83051199cd641dd4ed9057b958e5616df1309f19
generic

node/tequilapi/tequil/routes.go at 1.35.5 · mysteriumnetwork/node · GitHub

https://github.com/mysteriumnetwork/node/blob/1.35.5/tequilapi/tequil/routes.go#L26

Vendor Advisories for CVE-2026-31309(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 45× in last 7d / 89× 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. 2026-08-01 01:51 UTCGHSA enrichment
  2. 2026-07-31 21:07 UTCGHSA enrichment
  3. 2026-07-31 16:35 UTCGHSA enrichment
  4. 2026-07-31 12:15 UTCGHSA enrichment
  5. 2026-07-31 07:58 UTCGHSA enrichment
  6. 2026-07-31 03:42 UTCGHSA enrichment
  7. 2026-07-30 23:27 UTCGHSA enrichment
  8. 2026-07-30 19:11 UTCEG score recompute
  9. 2026-07-30 19:11 UTCGHSA enrichment
  10. 2026-07-30 16:27 UTCEPSS rescore
  11. 2026-07-30 14:47 UTCGHSA enrichment
  12. 2026-07-30 10:18 UTCEG score recompute
  13. 2026-07-30 10:18 UTCGHSA enrichment
  14. 2026-07-30 06:01 UTCGHSA enrichment
  15. 2026-07-30 01:45 UTCEG score recompute
  16. 2026-07-30 01:45 UTCGHSA enrichment
  17. 2026-07-30 01:30 UTCEPSS rescore
  18. 2026-07-29 21:20 UTCGHSA enrichment
  19. 2026-07-29 15:38 UTCGHSA enrichment
  20. 2026-07-29 11:21 UTCGHSA enrichment
  21. 2026-07-29 07:05 UTCGHSA enrichment
  22. 2026-07-29 02:48 UTCGHSA enrichment
  23. 2026-07-28 22:30 UTCGHSA enrichment
  24. 2026-07-28 18:06 UTCEG score recompute
  25. 2026-07-28 18:05 UTCGHSA enrichment
Show 64 more
  1. 2026-07-28 15:36 UTCEPSS rescore
  2. 2026-07-28 13:46 UTCGHSA enrichment
  3. 2026-07-28 09:21 UTCGHSA enrichment
  4. 2026-07-28 04:55 UTCGHSA enrichment
  5. 2026-07-28 00:38 UTCGHSA enrichment
  6. 2026-07-27 20:07 UTCGHSA enrichment
  7. 2026-07-27 15:42 UTCEG score recompute
  8. 2026-07-27 15:42 UTCGHSA enrichment
  9. 2026-07-27 10:20 UTCGHSA enrichment
  10. 2026-07-27 06:04 UTCGHSA enrichment
  11. 2026-07-27 01:24 UTCGHSA enrichment
  12. 2026-07-26 21:06 UTCGHSA enrichment
  13. 2026-07-26 16:50 UTCEG score recompute
  14. 2026-07-26 16:50 UTCGHSA enrichment
  15. 2026-07-26 14:54 UTCEPSS rescore
  16. 2026-07-26 14:54 UTCEPSS rescore
  17. 2026-07-26 12:33 UTCEG score recompute
  18. 2026-07-26 12:32 UTCGHSA enrichment
  19. 2026-07-25 14:18 UTCEPSS rescore
  20. 2026-07-25 14:17 UTCEPSS rescore
  21. 2026-07-24 14:17 UTCEPSS rescore
  22. 2026-07-23 14:18 UTCEPSS rescore
  23. 2026-07-23 14:18 UTCEPSS rescore
  24. 2026-07-23 03:08 UTCEG score recompute▲ 2.30
  25. 2026-07-22 14:08 UTCEPSS rescore
  26. 2026-07-22 14:08 UTCEPSS rescore
  27. 2026-07-21 15:24 UTCEPSS rescore
  28. 2026-07-21 15:24 UTCEPSS rescore
  29. 2026-07-20 17:08 UTCEPSS rescore
  30. 2026-07-20 17:08 UTCEPSS rescore
  31. 2026-07-19 14:31 UTCEPSS rescore
  32. 2026-07-19 14:31 UTCEPSS rescore
  33. 2026-07-19 02:29 UTCEPSS rescore
  34. 2026-07-18 10:04 UTCEPSS rescore
  35. 2026-07-18 10:04 UTCEPSS rescore
  36. 2026-07-16 22:16 UTCGHSA enrichment
  37. 2026-07-16 17:03 UTCEPSS rescore
  38. 2026-07-16 17:03 UTCEPSS rescore
  39. 2026-07-16 12:48 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  40. 2026-07-16 10:45 UTCGHSA enrichment
  41. 2026-07-15 23:13 UTCGHSA enrichment
  42. 2026-07-15 16:57 UTCEPSS rescore
  43. 2026-07-15 16:57 UTCEPSS rescore
  44. 2026-07-15 11:42 UTCGHSA enrichment
  45. 2026-07-15 02:00 UTCEPSS rescore
  46. 2026-07-15 02:00 UTCEPSS rescore
  47. 2026-07-15 00:09 UTCGHSA enrichment
  48. 2026-07-14 12:36 UTCGHSA enrichment
  49. 2026-07-14 01:05 UTCGHSA enrichment
  50. 2026-07-13 22:30 UTCEPSS rescore
  51. 2026-07-13 13:33 UTCGHSA enrichment
  52. 2026-07-13 06:13 UTCEPSS rescore
  53. 2026-07-13 06:13 UTCEPSS rescore
  54. 2026-07-13 02:02 UTCGHSA enrichment
  55. 2026-07-12 14:30 UTCGHSA enrichment
  56. 2026-07-12 05:46 UTCEPSS rescore
  57. 2026-07-12 02:58 UTCEG score recompute▲ 7.50
  58. 2026-07-12 02:58 UTCGHSA enrichment
  59. 2026-07-11 08:27 UTCEPSS rescore
  60. 2026-07-09 19:10 UTCEPSS rescore
  61. 2026-07-09 15:35 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  62. 2026-07-08 22:53 UTCNVD update
  63. 2026-07-08 22:04 UTCEG score recompute
  64. 2026-07-08 22:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-31309?
CVE-2026-31309 is a critical vulnerability published on July 8, 2026. Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a crafted POST request.
When was CVE-2026-31309 disclosed?
CVE-2026-31309 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31309 actively exploited?
CVE-2026-31309 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 63.8% of all scored CVEs.
What is the CVSS score of CVE-2026-31309?
CVE-2026-31309 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-31309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31309, 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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