CVE-2026-3593highCWE-416CWE-825

CVE-2026-3593: high-severity vulnerability in ISC BIND 9

Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.4epss 1.5%
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected products
ISC · BIND 9
Related CVEs — ISC BIND 9

In the same product, most dangerous first.

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