CVE-2026-5946

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-20. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Multiple flaws have been identified in named related to the handling of DNS messages whose CLASS is not Internet (IN) — for example, CHAOS or HESIOD, or DNS messages that specify meta-classes (ANY or NONE) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (UPDATE), zone change notifications (NOTIFY), or processing of IN-specific record types in non-IN data — can cause assertion failures in named. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
78%
KEV
Not listed

Published

May 20, 2026

Last Modified

September 17, 2026

Advisory Details (4)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic

CVE-2026-5946: Invalid handling of CLASS != IN

https://kb.isc.org/docs/cve-2026-5946
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-2026-5946(12)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhcos-418.94.202609031320-02026-09-17redhat
ubuntubind9-utils (1:9.20.11-1ubuntu2.4) @ questing2026-09-17ubuntu
ubuntulwresd (1:9.10.3.dfsg.P4-8ubuntu1.19+esm10) @ xenial2026-09-17ubuntu
redhatrhcos-416.94.202609011112-02026-09-10redhat
redhatbind-32:9.11.4-26.P2.el7_9.212026-08-26redhat
redhatbind-32:9.16.23-18.el9_4.122026-08-19redhat
redhatbind-32:9.16.23-31.el9_6.42026-08-17redhat
redhatbind-32:9.11.36-16.el8_10.82026-06-08redhat
redhatbind9.18-32:9.18.29-14.el9_8.22026-06-08redhat
redhatbind-32:9.18.33-15.el10_2.22026-06-08redhat
redhatbind-32:9.16.23-40.el9_8.22026-06-08redhat
redhatbind9.16-32:9.16.23-0.22.el8_10.62026-06-04redhat
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(6)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

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 12× in last 7d / 60× 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 334 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-5946?
CVE-2026-5946 is a high vulnerability published on May 20, 2026. Multiple flaws have been identified in named related to the handling of DNS messages whose CLASS is not Internet (IN) — for example, CHAOS or HESIOD, or DNS messages that specify meta-classes (ANY or NONE) in the question section. Specially crafted requests reaching the affected code paths —…
When was CVE-2026-5946 disclosed?
CVE-2026-5946 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5946 actively exploited?
CVE-2026-5946 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 21.6% of all scored CVEs.
What is the CVSS score of CVE-2026-5946?
CVE-2026-5946 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-5946?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5946, 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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