CVE-2026-39827

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% 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, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
9.5%
KEV
Not listed

Published

May 22, 2026

Last Modified

May 26, 2026

Advisory Details (4)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

GO-2026-5016 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5016
generic
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
generic

x/crypto/ssh: newChannel leak after Reject() · Issue #35127 · golang/go · GitHub

https://go.dev/issue/35127
generic
https://go.dev/cl/781320

Vendor Advisories for CVE-2026-39827(3)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
golang.org/x/crypto—0.52.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 45× 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 116 total refreshes for this CVE.

  1. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-13 22:30 UTCEPSS rescore
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-08 15:15 UTCEPSS rescore
  9. 2026-07-07 13:46 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 02:23 UTCEPSS rescore
  13. 2026-07-06 02:23 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-01 15:06 UTCEPSS rescore
  17. 2026-06-30 23:22 UTCEPSS rescore
  18. 2026-06-29 16:40 UTCEG score recompute
  19. 2026-06-29 16:40 UTCVendor advisory
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 04:56 UTCEPSS rescore
  23. 2026-06-27 20:47 UTCEG score recompute
  24. 2026-06-27 20:47 UTCVendor advisory
  25. 2026-06-27 03:08 UTCEPSS rescore
Show 75 more
  1. 2026-06-26 19:15 UTCEG score recompute
  2. 2026-06-26 19:15 UTCVendor advisory
  3. 2026-06-25 14:10 UTCEG score recompute
  4. 2026-06-25 14:10 UTCVendor advisory
  5. 2026-06-25 13:49 UTCEPSS rescore
  6. 2026-06-25 13:49 UTCEPSS rescore
  7. 2026-06-24 14:05 UTCEPSS rescore
  8. 2026-06-23 21:33 UTCEPSS rescore
  9. 2026-06-22 14:25 UTCEPSS rescore
  10. 2026-06-22 14:25 UTCEPSS rescore
  11. 2026-06-21 14:56 UTCEPSS rescore
  12. 2026-06-21 14:56 UTCEPSS rescore
  13. 2026-06-21 01:59 UTCEPSS rescore
  14. 2026-06-19 19:25 UTCEPSS rescore
  15. 2026-06-18 17:52 UTCEPSS rescore
  16. 2026-06-18 17:52 UTCEPSS rescore
  17. 2026-06-18 03:46 UTCEG score recompute
  18. 2026-06-17 17:53 UTCEPSS rescore
  19. 2026-06-17 02:13 UTCEG score recompute
  20. 2026-06-16 17:52 UTCEPSS rescore
  21. 2026-06-16 00:45 UTCEG score recompute
  22. 2026-06-16 00:45 UTCVendor advisory
  23. 2026-06-15 17:49 UTCEPSS rescore
  24. 2026-06-14 23:20 UTCEG score recompute
  25. 2026-06-14 23:20 UTCVendor advisory
  26. 2026-06-14 23:18 UTCEPSS rescore
  27. 2026-06-13 23:00 UTCEPSS rescore
  28. 2026-06-13 21:55 UTCEG score recompute
  29. 2026-06-12 23:12 UTCEPSS rescore
  30. 2026-06-12 23:12 UTCEPSS rescore
  31. 2026-06-12 18:12 UTCEG score recompute
  32. 2026-06-12 18:12 UTCVendor advisory
  33. 2026-06-11 16:47 UTCEG score recompute
  34. 2026-06-11 16:47 UTCVendor advisory
  35. 2026-06-11 14:00 UTCEPSS rescore
  36. 2026-06-10 22:18 UTCEPSS rescore
  37. 2026-06-10 15:22 UTCEG score recompute
  38. 2026-06-10 15:22 UTCVendor advisory
  39. 2026-06-10 13:22 UTCEPSS rescore
  40. 2026-06-09 13:54 UTCEG score recompute
  41. 2026-06-09 13:54 UTCVendor advisory
  42. 2026-06-08 14:17 UTCEPSS rescore
  43. 2026-06-08 14:17 UTCEPSS rescore
  44. 2026-06-08 12:29 UTCEG score recompute
  45. 2026-06-08 12:29 UTCVendor advisory
  46. 2026-06-07 15:25 UTCEPSS rescore
  47. 2026-06-07 15:25 UTCEPSS rescore
  48. 2026-06-07 15:25 UTCEPSS rescore
  49. 2026-06-07 11:04 UTCEG score recompute
  50. 2026-06-07 11:04 UTCVendor advisory
  51. 2026-06-06 13:47 UTCEPSS rescore
  52. 2026-06-06 13:47 UTCEPSS rescore
  53. 2026-06-06 09:39 UTCEG score recompute
  54. 2026-06-06 09:39 UTCVendor advisory
  55. 2026-06-05 22:47 UTCEPSS rescore
  56. 2026-06-05 22:47 UTCEPSS rescore
  57. 2026-06-05 08:15 UTCEG score recompute
  58. 2026-06-05 08:15 UTCVendor advisory
  59. 2026-06-05 06:10 UTCEPSS rescore
  60. 2026-06-05 06:10 UTCEPSS rescore
  61. 2026-06-04 13:12 UTCEPSS rescore
  62. 2026-06-04 13:12 UTCEPSS rescore
  63. 2026-06-04 06:50 UTCEG score recompute
  64. 2026-06-04 06:50 UTCVendor advisory
  65. 2026-06-03 05:24 UTCEG score recompute
  66. 2026-06-03 05:24 UTCVendor advisory
  67. 2026-06-02 20:13 UTCEPSS rescore
  68. 2026-06-02 03:59 UTCEG score recompute
  69. 2026-06-02 03:59 UTCVendor advisory
  70. 2026-06-01 13:52 UTCEPSS rescore
  71. 2026-06-01 13:52 UTCEPSS rescore
  72. 2026-06-01 13:51 UTCEPSS rescore
  73. 2026-06-01 02:34 UTCEG score recompute▲ 6.50
  74. 2026-06-01 02:34 UTCVendor advisory
  75. 2026-05-31 22:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-39827?
CVE-2026-39827 is a medium vulnerability published on May 22, 2026. An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for…
When was CVE-2026-39827 disclosed?
CVE-2026-39827 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on May 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39827 actively exploited?
CVE-2026-39827 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-39827?
CVE-2026-39827 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-39827?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39827, 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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