CVE-2026-3593

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.5%, top 27% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
73%
KEV
Not listed

Published

May 20, 2026

Last Modified

September 1, 2026

Advisory Details (7)

Auto-updated Sep 1, 2026
No patch confirmed yet.
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

CVE-2026-3593: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation

https://kb.isc.org/docs/cve-2026-3593
redhat Patch Available

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3593.json
redhat Patch Available

2479770 – (CVE-2026-3593) CVE-2026-3593 bind: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation

https://bugzilla.redhat.com/show_bug.cgi?id=2479770
redhat Patch Available

CVE-2026-3593 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-3593
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:7412

Vendor Advisories for CVE-2026-3593(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) @ jammy2026-08-24ubuntu
redhatbind-main-9.18.48-1.1.hum12026-04-10redhat

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

(7 across 7 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: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(2)

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 9× in last 7d / 146× 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 369 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-3593?
CVE-2026-3593 is a critical vulnerability published on May 20, 2026. A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.
When was CVE-2026-3593 disclosed?
CVE-2026-3593 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3593 actively exploited?
CVE-2026-3593 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 26.8% of all scored CVEs.
What is the CVSS score of CVE-2026-3593?
CVE-2026-3593 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-3593?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3593, 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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