CVE-2026-58253

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 70% 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
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.

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

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
30%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 13, 2026

Advisory Details (7)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Route API Auth Bypass · Advisory · nats-io/nats-server · GitHub

Affected: v2.14.0, v2.12.7 and v2.11.16.

https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45
github_release Patch Available

Release v2.14.0

Patch available: nats-io/nats-server v2.14.0

https://github.com/nats-io/nats-server/releases/tag/v2.14.0
github_release Patch Available

Release v2.12.7

Patch available: nats-io/nats-server v2.12.7

https://github.com/nats-io/nats-server/releases/tag/v2.12.7
github_release Patch Available

Release v2.11.16

Patch available: nats-io/nats-server v2.11.16

https://github.com/nats-io/nats-server/releases/tag/v2.11.16
github_commit

commit b86147e81710 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit b86147e81710 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3
github_commit

commit 8b8e1ad4ceed (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 8b8e1ad4ceed — awaiting tagged release

https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6
github_commit

commit 7b81dd455ea9 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 7b81dd455ea9 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6

Vendor Advisories for CVE-2026-58253(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nats-server2.10.1-1 ... 2.9.19-1 (14 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nats-server2.10.27-1, 2.12.4-1, 2.12.6-1, 2.14.1-1, 2.14.3-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nats-server2.10.27-1, 2.12.4-1, 2.12.6-12.14.1-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 99× 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 158 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-58253?
CVE-2026-58253 is a high vulnerability published on July 8, 2026. NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when noauthuser was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an…
When was CVE-2026-58253 disclosed?
CVE-2026-58253 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58253 actively exploited?
CVE-2026-58253 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 70.4% of all scored CVEs.
What is the CVSS score of CVE-2026-58253?
CVE-2026-58253 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-58253?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58253, 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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