CVE-2026-3593
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-3593.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-3593
Vendor advisory: security-officer@isc.org — https://kb.isc.org/docs/cve-2026-3593
Vendor advisory: security-officer@isc.org — https://downloads.isc.org/isc/bind9/9.21.22
Vendor advisory: security-officer@isc.org — https://downloads.isc.org/isc/bind9/9.20.23
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 1:9.20.23-1 |
| debian | sid | fixed | 1:9.20.23-1 |
| debian | trixie | fixed | 1:9.20.23-1~deb13u1 |
| sles | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| isc | bind | {"startIncluding":"9.20.0","endExcluding":"9.20.23"} | 9.20.23 |
References
CWEs
CWE-416
Verify integrity in audit chain (admin only). AS-IS.