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.
| Source | ID | Title |
|---|---|---|
Debian DSA |
DSA-6285-1 | bind9 security update |
Ubuntu USN |
USN-8293-1 | Bind vulnerabilities |
Solution
Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.23, 9.21.22, or 9.20.23-S1.
Workaround
Configurations not using DNS-over-HTTPS should not be affected. Disabling DNS-over-HTTPS is likewise an effective workaround.
Fri, 22 May 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-825 | |
| References |
| |
| Metrics |
threat_severity
|
threat_severity
|
Thu, 21 May 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* |
Wed, 20 May 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 20 May 2026 13:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation | |
| First Time appeared |
Isc
Isc bind |
|
| Weaknesses | CWE-416 | |
| CPEs | cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Isc
Isc bind |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
Sign in to view the affected projects.
Status: PUBLISHED
Assigner: isc
Published:
Updated: 2026-05-20T13:40:45.166Z
Reserved: 2026-03-05T12:57:16.981Z
Link: CVE-2026-3593
Updated: 2026-05-20T13:40:40.119Z
Status : Analyzed
Published: 2026-05-20T13:16:23.923
Modified: 2026-05-21T15:24:31.413
Link: CVE-2026-3593
OpenCVE Enrichment
Updated: 2026-05-22T03:00:12Z
Debian DSA
Ubuntu USN