CVE-2026-5950— Unbounded resend loop in BIND 9 resolver
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I. Basic Information for CVE-2026-5950
Vulnerability Information
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Vulnerability Title
Unbounded resend loop in BIND 9 resolver
Source: NVD (National Vulnerability Database)
Vulnerability Description
An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
循环条件输入未经检查
Source: NVD (National Vulnerability Database)
Vulnerability Title
ISC BIND 9 安全漏洞
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存在安全漏洞，该漏洞源于解析器状态机中存在无限制的重发循环，可能导致远程未认证攻击者造成严重资源耗尽。以下版本受到影响：9.18.36版本至9.18.48版本、9.20.8版本至9.20.22版本、9.21.7版本至9.21.21版本、9.18.36-S1版本至9.18.48-S1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-2026-5950
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Patches & Fixes for CVE-2026-5950 (1)
Vendor Advisories for CVE-2026-5950 (1)
- CVE-2026-5950: Unbounded resend loop in BIND 9 resolvervendor-advisory
Vendor Pages for CVE-2026-5950 (2)
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-2026-3593 | 7.4 HIGH | Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation |
| CVE-2026-3592 | 5.3 MEDIUM | Amplification vulnerabilities via self-pointed glue records |
IV. Related Vulnerabilities
Same product: BIND 9
- CVE-2026-5947
SIG(0) validation during query flood may lead to undefined b - CVE-2026-5946
Invalid handling of CLASS != IN - CVE-2026-3593
Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS i - 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-2026-5947
SIG(0) validation during query flood may lead to undefined b - CVE-2026-5946
Invalid handling of CLASS != IN - CVE-2026-3593
Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS i - CVE-2026-3592
Amplification vulnerabilities via self-pointed glue records - CVE-2026-3039
BIND 9 server memory exhaustion during GSS-API TKEY negotiat
Same weakness: CWE-606
- CVE-2026-0243
Prisma SD-WAN: Denial of Service (DoS) Vulnerability Through - CVE-2026-1519
Excessive NSEC3 iterations cause high CPU load during insecu - CVE-2019-25624
Liquid Studio 2.17 Denial of Service via Malformed Input - CVE-2026-27689
Denial of service (DOS) in SAP Supply Chain Management - CVE-2026-23689
Denial of service (DOS) in SAP Supply Chain Management
V. Comments for CVE-2026-5950
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