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 — 4 sources updated 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

August 25, 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(10)

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

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsutils (1:9.18.39-0ubuntu0.24.04.5) @ noble2026-08-25ubuntu
redhatbind-32:9.16.23-18.el9_4.122026-08-19redhat
redhatbind-32:9.16.23-31.el9_6.42026-08-17redhat
redhatbind-32:9.18.33-15.el10_2.22026-06-08redhat
redhatbind-32:9.11.36-16.el8_10.82026-06-08redhat
redhatbind-32:9.16.23-40.el9_8.22026-06-08redhat
redhatbind9.18-32:9.18.29-14.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

(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 23× in last 7d / 113× 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 290 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 August 25, 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 22.2% 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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