CVE-2026-58218

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM 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(medium)
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
48%
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) @ resolute2026-09-18ubuntu

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 ... 2:4.25.0~rc1+dfsg-1 (175 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 27× 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 189 total refreshes for this CVE.

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

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 51.7% 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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