CVE-2026-3593CRITICAL 7.4EPSS p72.4%

CVE-2026-3593CVE-2026-3593

isc / bind

Description

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.

Scoring

CVSS 3.17.4 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS1.54% probability of exploitation · percentile 72.4% · 2026-08-03T12:00:16Z
Published2026-05-20
Last modified2026-07-24

Underlying weaknesses· 1

CWE-416

References

  1. https://downloads.isc.org/isc/bind9/9.20.23
  2. https://downloads.isc.org/isc/bind9/9.21.22
  3. https://kb.isc.org/docs/cve-2026-3593

1

TypeTargetConfidenceTier
WeaknessUse After Freecwe-4160%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.