CVE-2026-39830

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 54% 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 — Patch released this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

May 22, 2026

Last Modified

July 24, 2026

Advisory Details (5)

Auto-updated Jun 1, 2026
No patch confirmed yet.
generic

GO-2026-5017 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5017
generic
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
generic

x/crypto/ssh: client can cause server deadlock on unexpected responses · Issue #79564 · golang/go · GitHub

https://go.dev/issue/79564
generic
https://go.dev/cl/781664
generic
https://go.dev/cl/781640

Vendor Advisories for CVE-2026-39830(20)

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

Patch Availability(29)

Vendor / EcosystemFixed in / PatchReleasedSource
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
redhatrhtas/rekor-cli-rhel9:17839693652026-07-16redhat
redhatflightctl-0:1.1.3-1.el9em2026-07-16redhat
redhatquay/quay-rhel9:17839558462026-07-16redhat
redhatrhtas/rekor-monitor-rhel9:17839685082026-07-16redhat
redhatrhtas/timestamp-authority-rhel9:17839686442026-07-16redhat
redhatquay/quay-rhel8:17837504472026-07-16redhat
redhatrhem/flightctl-worker-rhel10:17841949712026-07-16redhat
redhatopenshift-builds/openshift-builds-webhook-rhel9:17836121632026-07-16redhat
redhatrhem/flightctl-worker-rhel9:17841277752026-07-15redhat
redhatquay/quay-rhel8:17841258382026-07-15redhat
redhatrhoai/odh-trainer-rhel9:17824716562026-07-09redhat
redhatrhtas/model-validation-rhel9-operator:17829927272026-07-09redhat
redhatrhtas/rekor-monitor-rhel9:17833305722026-07-09redhat
redhatrhtas/model-transparency-cli-rhel9:17831838482026-07-09redhat
redhatpodman-7:5.8.2-4.el10_22026-07-09redhat
redhatrhtas/rekor-cli-rhel9:17833326252026-07-09redhat
redhatrhtas/timestamp-authority-rhel9:17833266902026-07-09redhat
redhatconforma-cli-stack-v1-4-1.4.22026-07-09redhat
redhatrhtas/policy-controller-rhel9-operator:17829034922026-07-09redhat
redhatodf4/rook-ceph-rhel9-operator:17829342842026-07-09redhat
redhatadvanced-cluster-security/rhacs-scanner-slim-rhel8:17828917892026-07-08redhat
redhatflightctl-0:1.0.3-1.el9em2026-07-08redhat
redhatopenshift-builds/openshift-builds-webhook-rhel9:17830582842026-07-08redhat
redhatdevworkspace/devworkspace-rhel9-operator:17824016742026-07-08redhat
redhatrhem/flightctl-worker-rhel9:17835024452026-07-08redhat

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

(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.

Additional Vendor Advisories

(16)

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 14× in last 7d / 49× 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 198 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-39830?
CVE-2026-39830 is a critical vulnerability published on May 22, 2026. A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.
When was CVE-2026-39830 disclosed?
CVE-2026-39830 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39830 actively exploited?
CVE-2026-39830 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 53.8% of all scored CVEs.
What is the CVSS score of CVE-2026-39830?
CVE-2026-39830 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-39830?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39830, 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-2026-39830

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