CVE-2026-59998

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 93% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 9, 2026

Advisory Details (3)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

oss-security - Announce: OpenSSH 10.4 released

https://www.openwall.com/lists/oss-security/2026/07/06/5
generic

OpenSSH: Release Notes

https://www.openssh.org/releasenotes.html#10.4p1
generic

'Announce: OpenSSH 10.4 released' - MARC

https://marc.info/?l=openssh-unix-dev&m=178333966933090&w=2

Vendor Advisories for CVE-2026-59998(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
ubuntussh-askpass-gnome (1:10.2p1-2ubuntu3.4) @ resolute2026-08-25ubuntu
redhatopenssh-main-10.4p1-1.hum12026-07-09redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-1 ... 1:9.9p2-2 (86 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-1 ... 1:9.9p2-2 (75 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-7 ... 1:10.4p1-4 (29 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-7 ... 1:10.3p1-9 (21 versions)1:10.4p1-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 22× in last 7d / 104× 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 155 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59998?
CVE-2026-59998 is a medium vulnerability published on July 8, 2026. sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.
When was CVE-2026-59998 disclosed?
CVE-2026-59998 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59998 actively exploited?
CVE-2026-59998 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 92.5% of all scored CVEs.
What is the CVSS score of CVE-2026-59998?
CVE-2026-59998 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-59998?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59998, 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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