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 92% 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) @ resolute2026-09-18ubuntu
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

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
openssh—10.3_p1-r1—
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 (77 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-7 ... 1:10.5p1-1 (31 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 15× in last 7d / 62× 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 199 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 05:47 UTCEG score recompute
  3. 2026-09-18 05:47 UTCVendor advisory
  4. 2026-09-18 05:47 UTCGHSA enrichment
  5. 2026-09-17 19:31 UTCEPSS rescore
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 03:11 UTCEPSS rescore
  9. 2026-09-14 08:58 UTCEG score recompute
  10. 2026-09-14 08:58 UTCVendor advisory
  11. 2026-09-14 08:58 UTCGHSA enrichment
  12. 2026-09-13 16:47 UTCEPSS rescore
  13. 2026-09-13 08:28 UTCEG score recompute
  14. 2026-09-13 08:28 UTCVendor advisory
  15. 2026-09-13 08:28 UTCGHSA enrichment
  16. 2026-09-12 03:40 UTCEG score recompute
  17. 2026-09-12 03:40 UTCVendor advisory
  18. 2026-09-12 03:40 UTCGHSA enrichment
  19. 2026-09-11 14:53 UTCEPSS rescore
  20. 2026-09-10 09:35 UTCEPSS rescore
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-05 22:52 UTCEG score recompute
  25. 2026-09-05 22:52 UTCVendor advisory
Show 75 more
  1. 2026-09-05 22:52 UTCGHSA enrichment
  2. 2026-09-04 05:07 UTCEPSS rescore
  3. 2026-09-02 14:12 UTCEPSS rescore
  4. 2026-09-01 13:54 UTCEPSS rescore
  5. 2026-09-01 04:40 UTCEPSS rescore
  6. 2026-08-30 19:17 UTCEPSS rescore
  7. 2026-08-30 07:40 UTCEG score recompute
  8. 2026-08-30 07:40 UTCVendor advisory
  9. 2026-08-30 07:40 UTCGHSA enrichment
  10. 2026-08-30 01:22 UTCEPSS rescore
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-27 21:54 UTCEG score recompute
  13. 2026-08-27 21:54 UTCVendor advisory
  14. 2026-08-27 21:54 UTCGHSA enrichment
  15. 2026-08-27 14:25 UTCEPSS rescore
  16. 2026-08-26 14:46 UTCEPSS rescore
  17. 2026-08-26 12:56 UTCEG score recompute
  18. 2026-08-26 12:56 UTCVendor advisory
  19. 2026-08-26 12:56 UTCGHSA enrichment
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-25 07:03 UTCEG score recompute
  22. 2026-08-25 07:03 UTCVendor advisory
  23. 2026-08-25 07:03 UTCGHSA enrichment
  24. 2026-08-24 06:32 UTCVendor advisory
  25. 2026-08-24 06:32 UTCGHSA enrichment
  26. 2026-08-23 05:19 UTCEG score recompute
  27. 2026-08-23 05:19 UTCVendor advisory
  28. 2026-08-23 05:19 UTCGHSA enrichment
  29. 2026-08-23 00:19 UTCEPSS rescore
  30. 2026-08-22 04:43 UTCEG score recompute
  31. 2026-08-22 04:43 UTCVendor advisory
  32. 2026-08-22 04:43 UTCGHSA enrichment
  33. 2026-08-21 23:49 UTCEPSS rescore
  34. 2026-08-21 04:09 UTCEG score recompute
  35. 2026-08-21 04:09 UTCVendor advisory
  36. 2026-08-21 04:09 UTCGHSA enrichment
  37. 2026-08-20 22:55 UTCEPSS rescore
  38. 2026-08-20 02:09 UTCEG score recompute
  39. 2026-08-20 02:09 UTCVendor advisory
  40. 2026-08-20 02:09 UTCGHSA enrichment
  41. 2026-08-19 17:04 UTCEPSS rescore
  42. 2026-08-19 00:20 UTCVendor advisory
  43. 2026-08-19 00:20 UTCGHSA enrichment
  44. 2026-08-17 23:50 UTCEG score recompute
  45. 2026-08-17 23:50 UTCVendor advisory
  46. 2026-08-17 23:50 UTCGHSA enrichment
  47. 2026-08-17 13:47 UTCEPSS rescore
  48. 2026-08-16 23:20 UTCEG score recompute
  49. 2026-08-16 23:20 UTCVendor advisory
  50. 2026-08-16 23:20 UTCGHSA enrichment
  51. 2026-08-16 14:56 UTCEPSS rescore
  52. 2026-08-16 02:14 UTCEPSS rescore
  53. 2026-08-15 22:50 UTCEG score recompute
  54. 2026-08-15 22:50 UTCVendor advisory
  55. 2026-08-15 22:50 UTCGHSA enrichment
  56. 2026-08-15 01:30 UTCEPSS rescore
  57. 2026-08-14 22:19 UTCEG score recompute
  58. 2026-08-14 22:19 UTCVendor advisory
  59. 2026-08-14 22:19 UTCGHSA enrichment
  60. 2026-08-13 22:00 UTCEPSS rescore
  61. 2026-08-13 21:49 UTCVendor advisory
  62. 2026-08-13 21:49 UTCGHSA enrichment
  63. 2026-08-12 21:19 UTCEG score recompute
  64. 2026-08-12 21:19 UTCVendor advisory
  65. 2026-08-12 21:19 UTCGHSA enrichment
  66. 2026-08-12 13:51 UTCEPSS rescore
  67. 2026-08-11 20:49 UTCEG score recompute
  68. 2026-08-11 20:49 UTCVendor advisory
  69. 2026-08-11 20:49 UTCGHSA enrichment
  70. 2026-08-11 00:00 UTCEPSS rescore
  71. 2026-08-10 20:19 UTCVendor advisory
  72. 2026-08-10 20:19 UTCGHSA enrichment
  73. 2026-08-09 19:49 UTCEG score recompute
  74. 2026-08-09 19:49 UTCVendor advisory
  75. 2026-08-09 19:49 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 92.2% 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.

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