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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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%
EPSS PROB
1.7%
EPSS %ILE
76th
KEV
Not listed

Published

May 20, 2026

Last Modified

September 17, 2026

Advisory Details (4)

Auto-updated Jun 6, 2026
Patch available.
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(15)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
bind—
  • 9.11.0 up to 9.18.49-r0: fixed in 9.18.49-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
bind—
  • 9.11.0 up to 9.18.49-r0: fixed in 9.18.49-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
bind—
  • 9.11.0 up to 9.20.23-r0: fixed in 9.20.23-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
bind—
  • 9.11.0 up to 9.20.23-r0: fixed in 9.20.23-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
bind—
  • 9.11.0 up to 9.20.23-r0: fixed in 9.20.23-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
bind91:9.16.15-1 ... 1:9.16.50-1~deb11u5 (17 versions)
  • every version up to 1:9.16.50-1~deb11u6: fixed in 1:9.16.50-1~deb11u6
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
bind91:9.18.12-1 ... 1:9.18.49-1~deb12u1 (16 versions)
  • every version up to 1:9.18.49-1~deb12u2: fixed in 1:9.18.49-1~deb12u2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
bind91:9.20.11-4 ... 1:9.20.23-1~deb13u1~bpo12+1 (17 versions)
  • every version up to 1:9.20.23-1~deb13u1: fixed in 1:9.20.23-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
bind91:9.20.11-4 ... 1:9.20.23-1~deb13u1~bpo12+1 (18 versions)
  • every version up to 1:9.20.23-1: fixed in 1:9.20.23-1
—

Weakness Classification(6)

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

Additional Vendor Advisories

(2)

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 8× in last 7d / 35× 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 349 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 1.7% probability of exploitation in the next 30 days (76th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-5946?
CVE-2026-5946 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-5946?
A fix for CVE-2026-5946 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-5946 are linked in the Vendor Advisories panel on this page.

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