CVE-2026-58218

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-07-30. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 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.

A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

July 30, 2026

Last Modified

July 30, 2026

Advisory Details (4)

Auto-updated Jul 30, 2026
Patch available. Sources: redhat.
generic

Samba - Security Announcement Archive

https://www.samba.org/samba/security/CVE-2026-58218.html
generic

16115 – (CVE-2026-58218) [SECURITY] CVE-2026-58218: DNS TKEY negotiation stores unauthenticated GSS contexts in a fixed FIFO before authentication completes

https://bugzilla.samba.org/show_bug.cgi?id=16115
redhat

2502728 – (CVE-2026-58218) CVE-2026-58218 samba: DNS signing DoS via TKEY name cache exhaustion

https://bugzilla.redhat.com/show_bug.cgi?id=2502728
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-58218

Vendor Advisories for CVE-2026-58218(1)

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
ubuntuwinbind (2:4.23.6+dfsg-1ubuntu2.2) @ resolute2026-08-25ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
samba2:4.13.13+dfsg-1 ... 2:4.24.5+dfsg-1~bpo13+1 (245 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
samba2:4.17.10+dfsg-0+deb12u1 ... 2:4.24.5+dfsg-1~bpo13+1 (173 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.10+dfsg-0+deb13u1 ... 2:4.22.8+dfsg-0+deb13u2 (9 versions)2:4.22.10+dfsg-0+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.3+dfsg-4 ... 2:4.24.5+dfsg-1~bpo13+1 (34 versions)2:4.24.5+dfsg-1—

Weakness Classification(1)

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 24× in last 7d / 105× 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 105 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-58218?
CVE-2026-58218 is a medium vulnerability published on July 30, 2026. A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the…
When was CVE-2026-58218 disclosed?
CVE-2026-58218 was first published in the National Vulnerability Database on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58218 actively exploited?
CVE-2026-58218 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 52.9% of all scored CVEs.
What is the CVSS score of CVE-2026-58218?
CVE-2026-58218 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-58218?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58218, 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

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