CVE-2026-39833

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 72% 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
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
28.2%
KEV
Not listed

Published

May 22, 2026

Last Modified

May 28, 2026

Advisory Details (5)

Auto-updated May 28, 2026
No patch confirmed yet.
generic

GO-2026-5005 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5005
generic
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
generic

x/crypto/ssh/agent: `lifetime` without `confirm` constraint · Issue #79436 · golang/go · GitHub

https://go.dev/issue/79436
generic
https://go.dev/cl/778641
generic
https://go.dev/cl/778640

Vendor Advisories for CVE-2026-39833(7)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulxd-tools (2.0.11-0ubuntu1~16.04.4+esm3) @ xenial2026-06-29ubuntu

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(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 9× in last 7d / 82× 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 247 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. 2026-07-07 13:46 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 20:39 UTCEG score recompute
  20. 2026-06-29 20:39 UTCVendor advisory
  21. 2026-06-29 16:39 UTCEG score recompute
  22. 2026-06-29 16:39 UTCVendor advisory
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 11:54 UTCEG score recompute
Show 75 more
  1. 2026-06-28 11:54 UTCVendor advisory
  2. 2026-06-28 07:50 UTCEG score recompute
  3. 2026-06-28 07:50 UTCVendor advisory
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-28 03:28 UTCEG score recompute
  6. 2026-06-28 03:28 UTCVendor advisory
  7. 2026-06-27 23:30 UTCEG score recompute
  8. 2026-06-27 23:30 UTCVendor advisory
  9. 2026-06-27 19:32 UTCEG score recompute
  10. 2026-06-27 19:32 UTCVendor advisory
  11. 2026-06-27 11:51 UTCEG score recompute
  12. 2026-06-27 11:51 UTCVendor advisory
  13. 2026-06-27 07:21 UTCEG score recompute
  14. 2026-06-27 07:21 UTCVendor advisory
  15. 2026-06-27 03:08 UTCEPSS rescore
  16. 2026-06-26 23:18 UTCEG score recompute
  17. 2026-06-26 23:18 UTCVendor advisory
  18. 2026-06-26 19:14 UTCEG score recompute
  19. 2026-06-26 19:14 UTCVendor advisory
  20. 2026-06-26 03:18 UTCEG score recompute
  21. 2026-06-26 03:18 UTCVendor advisory
  22. 2026-06-25 23:15 UTCEG score recompute
  23. 2026-06-25 23:15 UTCVendor advisory
  24. 2026-06-25 18:20 UTCEG score recompute
  25. 2026-06-25 18:20 UTCVendor advisory
  26. 2026-06-25 14:09 UTCEG score recompute
  27. 2026-06-25 14:09 UTCVendor advisory
  28. 2026-06-25 13:49 UTCEPSS rescore
  29. 2026-06-25 13:49 UTCEPSS rescore
  30. 2026-06-24 14:05 UTCEPSS rescore
  31. 2026-06-23 21:33 UTCEPSS rescore
  32. 2026-06-22 14:25 UTCEPSS rescore
  33. 2026-06-22 14:25 UTCEPSS rescore
  34. 2026-06-21 14:56 UTCEPSS rescore
  35. 2026-06-21 14:56 UTCEPSS rescore
  36. 2026-06-21 01:59 UTCEPSS rescore
  37. 2026-06-19 19:25 UTCEPSS rescore
  38. 2026-06-18 17:52 UTCEPSS rescore
  39. 2026-06-18 17:52 UTCEPSS rescore
  40. 2026-06-18 03:52 UTCEG score recompute
  41. 2026-06-18 03:52 UTCVendor advisory
  42. 2026-06-17 23:54 UTCEG score recompute
  43. 2026-06-17 19:56 UTCEG score recompute
  44. 2026-06-17 19:56 UTCVendor advisory
  45. 2026-06-17 17:53 UTCEPSS rescore
  46. 2026-06-17 14:56 UTCEG score recompute
  47. 2026-06-17 10:58 UTCEG score recompute
  48. 2026-06-17 03:24 UTCEG score recompute
  49. 2026-06-16 23:26 UTCEG score recompute
  50. 2026-06-16 23:26 UTCVendor advisory
  51. 2026-06-16 19:29 UTCEG score recompute
  52. 2026-06-16 19:29 UTCVendor advisory
  53. 2026-06-16 17:52 UTCEPSS rescore
  54. 2026-06-16 10:42 UTCEG score recompute
  55. 2026-06-16 10:42 UTCVendor advisory
  56. 2026-06-16 06:43 UTCEG score recompute
  57. 2026-06-16 06:43 UTCVendor advisory
  58. 2026-06-16 02:45 UTCEG score recompute
  59. 2026-06-16 02:45 UTCVendor advisory
  60. 2026-06-15 22:45 UTCEG score recompute
  61. 2026-06-15 22:45 UTCVendor advisory
  62. 2026-06-15 17:49 UTCEPSS rescore
  63. 2026-06-15 14:59 UTCEG score recompute
  64. 2026-06-15 14:59 UTCVendor advisory
  65. 2026-06-15 06:19 UTCEG score recompute
  66. 2026-06-15 06:19 UTCVendor advisory
  67. 2026-06-15 02:17 UTCEG score recompute
  68. 2026-06-15 02:17 UTCVendor advisory
  69. 2026-06-14 23:18 UTCEPSS rescore
  70. 2026-06-14 22:19 UTCEG score recompute
  71. 2026-06-14 22:19 UTCVendor advisory
  72. 2026-06-14 18:21 UTCEG score recompute
  73. 2026-06-14 18:21 UTCVendor advisory
  74. 2026-06-14 14:04 UTCEG score recompute
  75. 2026-06-14 14:04 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-39833?
CVE-2026-39833 is a critical vulnerability published on May 22, 2026. The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when…
When was CVE-2026-39833 disclosed?
CVE-2026-39833 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39833 actively exploited?
CVE-2026-39833 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-39833?
CVE-2026-39833 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-39833?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39833, 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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