CVE-2026-59851

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-21. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 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

A fix is available — apply it.

A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, allowing authenticated clients to log in as arbitrary users.

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
22%
KEV
Not listed

Published

July 21, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Jul 21, 2026
Patch available. Sources: redhat.
redhat

2498184 – (CVE-2026-59851) CVE-2026-59851 libssh: libssh: authentication bypass via missing GSSAPI principal check

https://bugzilla.redhat.com/show_bug.cgi?id=2498184
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-59851

Vendor Advisories for CVE-2026-59851(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibssh-0:0.12.0-3.el10_22026-08-17redhat
redhatlibssh-main-0.12.1-4.hum12026-07-21redhat

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)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libssh0.11.2-1, 0.11.3-1, 0.12.0-1, 0.12.0-2, 0.12.0-30.12.1-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 114× 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 279 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59851?
CVE-2026-59851 is a high vulnerability published on July 21, 2026. A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, allowing authenticated clients to log in as arbitrary users.
When was CVE-2026-59851 disclosed?
CVE-2026-59851 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59851 actively exploited?
CVE-2026-59851 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 78.2% of all scored CVEs.
What is the CVSS score of CVE-2026-59851?
CVE-2026-59851 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-59851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59851, 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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