CVE-2026-3593

9.8 criticalEPSS 1.5%

Critical (9.8) in isc bind. EPSS 1.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
CWEs: CWE-416, CWE-825
Published: 2026-05-20
Modified: 2026-08-24
Record from: the NVD, synced 2026-10-19

Affected

isc:bind

References

https://downloads.isc.org/isc/bind9/9.20.23
https://downloads.isc.org/isc/bind9/9.21.22
https://kb.isc.org/docs/cve-2026-3593
https://access.redhat.com/errata/RHSA-2026:7412
https://access.redhat.com/security/cve/CVE-2026-3593

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