CVE-2026-39835

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 58% 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: cisa-adp, epss
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

A fix is available — apply it.

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)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

May 22, 2026

Last Modified

September 18, 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.

Patch Availability(27)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshift-logging/cluster-logging-rhel9-operator:17884395052026-09-10redhat
redhatoadp/oadp-velero-rhel9:17888604612026-09-09redhat
redhatrhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel9:17881810542026-09-08redhat
redhatdevspaces/traefik-rhel9:17877567992026-09-01redhat
redhatrhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel9:17870019482026-08-27redhat
redhatmulticluster-engine/hypershift-addon-rhel9-operator:17866371852026-08-25redhat
redhatoadp/oadp-velero-rhel9:17869445402026-08-25redhat
redhatmulticluster-engine/hypershift-addon-rhel9-operator:17869120062026-08-19redhat
redhatexternal-secrets-operator/external-secrets-rhel9:17866146762026-08-13redhat
redhatopenshift-0:4.22.0-202608010430.p2.g5f1e0e7.assembly.stream.el82026-08-11redhat
redhatopenshift4/ose-hyperkube-rhel9:17858846882026-08-11redhat
redhatopenshift-gitops-1/argocd-rhel8:17851492602026-08-10redhat
redhatopenshift-gitops-1/argocd-rhel9:17852113462026-08-10redhat
redhatoadp/oadp-velero-rhel9:17851808782026-08-06redhat
redhatconforma-cli-stack-v1-4-1.4.32026-08-05redhat
redhatmulticluster-engine/hypershift-addon-rhel9-operator:17847387582026-07-29redhat
redhatmulticluster-engine/cluster-image-set-controller-rhel9:17841586792026-07-29redhat
redhatcryostat/cryostat-storage-rhel9:4.2.0-192026-07-29redhat
redhatmulticluster-engine/hypershift-addon-rhel9-operator:17845644382026-07-28redhat
redhatoadp/oadp-velero-rhel9:17840588222026-07-22redhat
redhatquay/quay-rhel8:17843539042026-07-21redhat
redhatquay/quay-rhel8:17843519662026-07-21redhat
redhatquay/quay-rhel8:17837518652026-07-20redhat
redhatopenshift-builds/openshift-builds-webhook-rhel9:17836121632026-07-16redhat
redhatflightctl-0:1.1.3-1.el9em2026-07-16redhat
redhatquay/quay-rhel9:17839558462026-07-16redhat
redhatrhtas/rekor-monitor-rhel9:17839685082026-07-16redhat

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)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
golang-go.crypto1:0.0~git20201221.eec23a3-1 ... 1:0.53.0-1 (40 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
golang-go.crypto1:0.10.0-1 ... 1:0.56.0-1 (36 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
golang-go.crypto1:0.25.0-1 ... 1:0.56.0-1 (21 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
golang-go.crypto1:0.25.0-1 ... 1:0.52.0-1~bpo13+1 (16 versions)1:0.52.0-1—
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

(25)

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 19× in last 7d / 84× 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 288 total refreshes for this CVE.

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

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 September 18, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 58.0% of all scored CVEs.
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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-39835

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