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
49%
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
ubuntubind9-utils (1:9.20.18-1ubuntu2.1) @ resolute2026-08-23ubuntu
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.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
bind—9.18.49-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
bind—9.18.49-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
bind—9.20.23-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
bind—9.20.23-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
bind—9.20.23-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
bind91:9.16.15-1 ... 1:9.16.50-1~deb11u5 (17 versions)1:9.16.50-1~deb11u6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
bind91:9.18.12-1 ... 1:9.18.49-1~deb12u1 (16 versions)1:9.18.49-1~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
bind91:9.20.11-4 ... 1:9.20.23-1~deb13u1~bpo12+1 (17 versions)1:9.20.23-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
bind91:9.20.11-4 ... 1:9.20.23-1~deb13u1~bpo12+1 (18 versions)1:9.20.23-1—

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 14× in last 7d / 79× 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 223 total refreshes for this CVE.

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

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 51.2% 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.

Dependency Blast Radius

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