CVE-2026-3593
9.8
CRITICAL
CVSS 3.1
EPSS 0.04%
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.
How to fix CVE-2026-3593
To remediate CVE-2026-3593, upgrade the affected package to a fixed version below.
- Alpine/bind—upgrade to 9.18.49-r0 or later
- —upgrade to 1:9.20.23-1~deb13u1 or later
Is CVE-2026-3593 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 9.18.49-r0
- from 0, < 1:9.20.23-1~deb13u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |