CVE-2026-3593— Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation
Possible ATT&CK Techniques 2AI
T1203 · Exploitation for Client Execution T1190 · Exploit Public-Facing ApplicationGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-3593
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
ISC BIND 9 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND 9是ISC组织的一个域名系统软件。 ISC BIND 9存在资源管理错误漏洞，该漏洞源于DNS-over-HTTPS实现中存在释放后重用。以下版本受到影响：9.20.0版本至9.20.22版本、9.21.0版本至9.21.21版本和9.20.9-S1版本至9.20.22-S1版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-3593
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-3593
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-3593 (1)
Vendor Advisories for CVE-2026-3593 (1)
Vendor Pages for CVE-2026-3593 (1)
Same Patch Batch · ISC · 2026-05-20 · 6 CVEs total
| CVE-2026-3039 | 7.5 HIGH | BIND 9 server memory exhaustion during GSS-API TKEY negotiation |
| CVE-2026-5947 | 7.5 HIGH | SIG(0) validation during query flood may lead to undefined behavior |
| CVE-2026-5946 | 7.5 HIGH | Invalid handling of CLASS != IN |
| CVE-2026-3592 | 5.3 MEDIUM | Amplification vulnerabilities via self-pointed glue records |
| CVE-2026-5950 | 5.3 MEDIUM | Unbounded resend loop in BIND 9 resolver |
IV. Related Vulnerabilities
Same product: BIND 9
- CVE-2026-5950
Unbounded resend loop in BIND 9 resolver - CVE-2026-5947
SIG(0) validation during query flood may lead to undefined b - CVE-2026-5946
Invalid handling of CLASS != IN - CVE-2026-3592
Amplification vulnerabilities via self-pointed glue records - CVE-2026-3039
BIND 9 server memory exhaustion during GSS-API TKEY negotiat
Same vendor: ISC
- CVE-2026-5950
Unbounded resend loop in BIND 9 resolver - CVE-2026-5947
SIG(0) validation during query flood may lead to undefined b - CVE-2026-5946
Invalid handling of CLASS != IN - CVE-2026-3592
Amplification vulnerabilities via self-pointed glue records - CVE-2026-3039
BIND 9 server memory exhaustion during GSS-API TKEY negotiat
V. Comments for CVE-2026-3593
No comments yet