CVE-2026-39835

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 89% 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
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
31.6%
KEV
Not listed

Published

May 22, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jun 14, 2026
No patch confirmed yet.
generic

GO-2026-5015 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5015
generic
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
generic

x/crypto/ssh: server panic during CheckHostKey/Authenticate · Issue #79563 · golang/go · GitHub

https://go.dev/issue/79563
generic
https://go.dev/cl/781660

Vendor Advisories for CVE-2026-39835(20)

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(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 48× 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 121 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-39835?
CVE-2026-39835 is a medium vulnerability published on May 22, 2026. SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.
When was CVE-2026-39835 disclosed?
CVE-2026-39835 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39835 actively exploited?
CVE-2026-39835 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-39835?
CVE-2026-39835 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-39835?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39835, 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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