CVE-2026-3593

CRITICALNVD 9.87.4▼
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-05-20. NVD baseline CVSS 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 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
7.4(medium)
EPSS
76.6%
KEV
Not listed

Published

May 20, 2026

Last Modified

July 15, 2026

Advisory Details (7)

Auto-updated Jul 16, 2026
Patch available. Sources: redhat.
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-details

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

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

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

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
ubuntubind9-utils (1:9.20.18-1ubuntu2.1) @ resolute2026-06-29ubuntu
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.

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 10× in last 7d / 52× 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 165 total refreshes for this CVE.

  1. 2026-07-19 02:29 UTCEPSS rescore
  2. 2026-07-18 10:04 UTCEPSS rescore
  3. 2026-07-17 22:59 UTCOSV refresh
  4. 2026-07-16 17:03 UTCEPSS rescore
  5. 2026-07-15 16:57 UTCEPSS rescore
  6. 2026-07-15 16:57 UTCEPSS rescore
  7. 2026-07-15 02:25 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  8. 2026-07-15 02:00 UTCEPSS rescore
  9. 2026-07-15 01:21 UTCMITRE cvelistV5CVSS v3 → 7.4 · severity → HIGH
  10. 2026-07-13 22:30 UTCEPSS rescore
  11. 2026-07-12 05:46 UTCEPSS rescore
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-09 19:10 UTCEPSS rescore
  14. 2026-07-08 15:15 UTCEPSS rescore
  15. 2026-07-07 13:46 UTCEPSS rescore
  16. 2026-07-06 16:27 UTCEPSS rescore
  17. 2026-07-06 16:27 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-06 02:23 UTCEPSS rescore
  20. 2026-07-05 02:30 UTCEPSS rescore
  21. 2026-07-04 06:31 UTCEPSS rescore
  22. 2026-07-01 15:06 UTCEPSS rescore
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-30 04:33 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  25. 2026-06-29 20:29 UTCVendor advisory
Show 75 more
  1. 2026-06-29 20:29 UTCGHSA enrichment
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 07:56 UTCVendor advisory
  5. 2026-06-28 07:56 UTCGHSA enrichment
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-27 20:14 UTCVendor advisory
  8. 2026-06-27 20:14 UTCGHSA enrichment
  9. 2026-06-27 07:26 UTCVendor advisory
  10. 2026-06-27 07:26 UTCGHSA enrichment
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-26 19:34 UTCVendor advisory
  13. 2026-06-26 19:34 UTCGHSA enrichment
  14. 2026-06-26 03:48 UTCVendor advisory
  15. 2026-06-26 03:48 UTCGHSA enrichment
  16. 2026-06-25 15:38 UTCVendor advisory
  17. 2026-06-25 15:38 UTCGHSA enrichment
  18. 2026-06-25 13:49 UTCEPSS rescore
  19. 2026-06-25 13:49 UTCEPSS rescore
  20. 2026-06-24 14:05 UTCEPSS rescore
  21. 2026-06-23 21:33 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-22 14:25 UTCEPSS rescore
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 14:56 UTCEPSS rescore
  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-19 19:25 UTCEPSS rescore
  28. 2026-06-18 17:52 UTCEPSS rescore
  29. 2026-06-18 17:52 UTCEPSS rescore
  30. 2026-06-17 23:05 UTCVendor advisory
  31. 2026-06-17 23:05 UTCGHSA enrichment
  32. 2026-06-17 17:53 UTCEPSS rescore
  33. 2026-06-17 11:26 UTCVendor advisory
  34. 2026-06-17 11:26 UTCGHSA enrichment
  35. 2026-06-16 20:13 UTCVendor advisory
  36. 2026-06-16 20:13 UTCGHSA enrichment
  37. 2026-06-16 17:52 UTCEPSS rescore
  38. 2026-06-16 03:26 UTCVendor advisory
  39. 2026-06-16 03:25 UTCGHSA enrichment
  40. 2026-06-15 17:49 UTCEPSS rescore
  41. 2026-06-15 15:51 UTCVendor advisory
  42. 2026-06-15 15:51 UTCGHSA enrichment
  43. 2026-06-14 21:38 UTCVendor advisory
  44. 2026-06-14 21:38 UTCGHSA enrichment
  45. 2026-06-14 10:05 UTCVendor advisory
  46. 2026-06-14 10:05 UTCGHSA enrichment
  47. 2026-06-13 23:00 UTCEPSS rescore
  48. 2026-06-13 22:29 UTCVendor advisory
  49. 2026-06-13 22:29 UTCGHSA enrichment
  50. 2026-06-13 04:40 UTCVendor advisory
  51. 2026-06-13 04:40 UTCGHSA enrichment
  52. 2026-06-12 23:12 UTCEPSS rescore
  53. 2026-06-12 23:12 UTCEPSS rescore
  54. 2026-06-12 17:06 UTCVendor advisory
  55. 2026-06-12 17:06 UTCGHSA enrichment
  56. 2026-06-12 05:31 UTCVendor advisory
  57. 2026-06-12 05:31 UTCGHSA enrichment
  58. 2026-06-11 17:58 UTCVendor advisory
  59. 2026-06-11 17:58 UTCGHSA enrichment
  60. 2026-06-11 14:00 UTCEPSS rescore
  61. 2026-06-11 06:23 UTCVendor advisory
  62. 2026-06-11 06:23 UTCGHSA enrichment
  63. 2026-06-10 22:18 UTCEPSS rescore
  64. 2026-06-10 18:49 UTCVendor advisory
  65. 2026-06-10 18:49 UTCGHSA enrichment
  66. 2026-06-10 13:22 UTCEPSS rescore
  67. 2026-06-10 07:16 UTCVendor advisory
  68. 2026-06-10 07:16 UTCGHSA enrichment
  69. 2026-06-09 19:35 UTCVendor advisory
  70. 2026-06-09 19:35 UTCGHSA enrichment
  71. 2026-06-09 08:02 UTCVendor advisory
  72. 2026-06-09 08:02 UTCGHSA enrichment
  73. 2026-06-08 20:27 UTCVendor advisory
  74. 2026-06-08 20:27 UTCGHSA enrichment
  75. 2026-06-08 14:17 UTCEPSS rescore

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 July 15, 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 76.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-3593?
CVE-2026-3593 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.4.
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

Explore the affected products and dependency analysis for CVE-2026-3593

Explore →

Is Your Infrastructure Affected by CVE-2026-3593?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs