CVE-2026-5950

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-05-20. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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.

An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

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

May 20, 2026

Last Modified

July 23, 2026

Advisory Details (4)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

CVE-2026-5950: Unbounded resend loop in BIND 9 resolver

https://kb.isc.org/docs/cve-2026-5950
generic

Index of /isc/bind9/9.21.22

https://downloads.isc.org/isc/bind9/9.21.22
generic

Index of /isc/bind9/9.20.23

https://downloads.isc.org/isc/bind9/9.20.23
generic

Index of /isc/bind9/9.18.49

https://downloads.isc.org/isc/bind9/9.18.49

Vendor Advisories for CVE-2026-5950(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsutils (1:9.18.39-0ubuntu0.22.04.4) @ jammy2026-07-26ubuntu
redhatbind-main-9.18.49-1.hum12026-05-21redhat

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.

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 17× in last 7d / 54× 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 144 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 08:15 UTCEG score recompute
  4. 2026-07-26 08:15 UTCVendor advisory
  5. 2026-07-26 08:14 UTCGHSA enrichment
  6. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-25 14:18 UTCEPSS rescore
  8. 2026-07-24 14:18 UTCEPSS rescore
  9. 2026-07-24 14:18 UTCEPSS rescore
  10. 2026-07-23 14:18 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 03:21 UTCEG score recompute
  13. 2026-07-22 14:08 UTCEPSS rescore
  14. 2026-07-22 14:08 UTCEPSS rescore
  15. 2026-07-21 15:25 UTCEPSS rescore
  16. 2026-07-21 15:25 UTCEPSS rescore
  17. 2026-07-20 17:08 UTCEPSS rescore
  18. 2026-07-19 14:31 UTCEPSS rescore
  19. 2026-07-19 02:29 UTCEPSS rescore
  20. 2026-07-18 10:04 UTCEPSS rescore
  21. 2026-07-17 22:59 UTCOSV refresh
  22. 2026-07-16 17:03 UTCEPSS rescore
  23. 2026-07-15 16:57 UTCEPSS rescore
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-15 02:00 UTCEPSS rescore
Show 75 more
  1. 2026-07-13 22:31 UTCEPSS rescore
  2. 2026-07-13 06:13 UTCEPSS rescore
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-12 05:46 UTCEPSS rescore
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-08 15:16 UTCEPSS rescore
  10. 2026-07-08 15:16 UTCEPSS rescore
  11. 2026-07-07 13:46 UTCEPSS rescore
  12. 2026-07-07 13:46 UTCEPSS rescore
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-05 02:31 UTCEPSS rescore
  18. 2026-07-05 02:30 UTCEPSS rescore
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-29 20:29 UTCVendor advisory
  24. 2026-06-29 20:29 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
  26. 2026-06-28 14:07 UTCEPSS rescore
  27. 2026-06-28 04:56 UTCEPSS rescore
  28. 2026-06-27 20:13 UTCVendor advisory
  29. 2026-06-27 20:13 UTCGHSA enrichment
  30. 2026-06-27 03:08 UTCEPSS rescore
  31. 2026-06-26 19:34 UTCVendor advisory
  32. 2026-06-26 19:34 UTCGHSA enrichment
  33. 2026-06-25 15:35 UTCVendor advisory
  34. 2026-06-25 15:35 UTCGHSA enrichment
  35. 2026-06-25 13:50 UTCEPSS rescore
  36. 2026-06-24 14:05 UTCEPSS rescore
  37. 2026-06-23 21:33 UTCEPSS rescore
  38. 2026-06-23 21:33 UTCEPSS rescore
  39. 2026-06-22 14:25 UTCEPSS rescore
  40. 2026-06-22 14:25 UTCEPSS rescore
  41. 2026-06-21 14:56 UTCEPSS rescore
  42. 2026-06-21 14:56 UTCEPSS rescore
  43. 2026-06-21 01:59 UTCEPSS rescore
  44. 2026-06-21 01:59 UTCEPSS rescore
  45. 2026-06-19 19:26 UTCEPSS rescore
  46. 2026-06-19 19:26 UTCEPSS rescore
  47. 2026-06-18 17:52 UTCEPSS rescore
  48. 2026-06-18 17:52 UTCEPSS rescore
  49. 2026-06-17 21:34 UTCVendor advisory
  50. 2026-06-17 21:34 UTCGHSA enrichment
  51. 2026-06-17 17:53 UTCEPSS rescore
  52. 2026-06-16 22:15 UTCVendor advisory
  53. 2026-06-16 22:15 UTCGHSA enrichment
  54. 2026-06-16 17:53 UTCEPSS rescore
  55. 2026-06-15 22:55 UTCVendor advisory
  56. 2026-06-15 22:54 UTCGHSA enrichment
  57. 2026-06-15 17:49 UTCEPSS rescore
  58. 2026-06-15 17:49 UTCEPSS rescore
  59. 2026-06-14 23:18 UTCEPSS rescore
  60. 2026-06-14 21:48 UTCVendor advisory
  61. 2026-06-14 21:48 UTCGHSA enrichment
  62. 2026-06-13 23:00 UTCEPSS rescore
  63. 2026-06-13 22:28 UTCVendor advisory
  64. 2026-06-13 22:28 UTCGHSA enrichment
  65. 2026-06-12 23:12 UTCEPSS rescore
  66. 2026-06-12 23:12 UTCEPSS rescore
  67. 2026-06-12 19:30 UTCVendor advisory
  68. 2026-06-12 19:30 UTCGHSA enrichment
  69. 2026-06-11 20:10 UTCVendor advisory
  70. 2026-06-11 20:10 UTCGHSA enrichment
  71. 2026-06-11 14:00 UTCEPSS rescore
  72. 2026-06-10 22:19 UTCEPSS rescore
  73. 2026-06-10 20:51 UTCVendor advisory
  74. 2026-06-10 20:51 UTCGHSA enrichment
  75. 2026-06-10 13:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-5950?
CVE-2026-5950 is a medium vulnerability published on May 20, 2026. An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through…
When was CVE-2026-5950 disclosed?
CVE-2026-5950 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5950 actively exploited?
CVE-2026-5950 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 52.2% of all scored CVEs.
What is the CVSS score of CVE-2026-5950?
CVE-2026-5950 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-5950?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5950, 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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