CVE-2026-44687— harder-below-nxdomain逻辑存在漏洞可导致NXDOMAIN被影子
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一、 漏洞 CVE-2026-44687 基础信息
漏洞信息
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Vulnerability Title
Off-by-one error in 'harden-below-nxdomain' logic can shadow a stub/forward zone by a legitimate parent's NXDOMAIN
来源: 美国国家漏洞数据库 NVD
Vulnerability Description
In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed zone could be shadowed by the intermediate label's secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in 'harden-below-nxdomain' logic; enabled by default. It effectively bypasses the configuration and the configured stub/forward zone is never contacted. 'harden-below-nxdomain' does an upward DNS cache walk together with a delegation point guard that does not allow NXDOMAIN synthesis above stub/forward zones. The guard tests the domain name but before stripping a label. This results in an iteration where the domain name equals the configured stub/forward zone apex that passes the guard, strips one more label, and probes the cache at the apex's immediate public parent. If that parent has a cached DNSSEC-secure NXDOMAIN, which it will for any private namespace nested two or more labels under a signed public name, the walk returns it and the configured stub/forward upstream is never contacted. This can only be triggered by the query for the intermediate label (between the stub/forward apex and the DNSSEC parent zone).
来源: 美国国家漏洞数据库 NVD
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
来源: 美国国家漏洞数据库 NVD
Vulnerability Type
Off-by-one错误
来源: 美国国家漏洞数据库 NVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| NLnet Labs | Unbound | 1.13.2 ~ 1.25.2 | - |
二、漏洞 CVE-2026-44687 的公开POC
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|---|
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CVE-2026-44687 厂商安全公告 (1)
同批安全公告 · NLnet Labs · 2026-07-22 · 共 24 条
| CVE-2026-55973 | 7.5 HIGH | DNS错误报告导致栈缓冲区溢出 |
| CVE-2026-44690 | 7.5 HIGH | 通过RRSIG.labels操控实现跨区通配符缓存投毒漏洞 |
| CVE-2026-32665 | 7.5 HIGH | DNS-over-QUIC拒绝服务漏洞因`quic-size`预算绕过 |
| CVE-2026-40691 | 7.5 HIGH | DNSCrypt over TCP 死亡数据包漏洞 |
| CVE-2026-50248 | 6.5 MEDIUM | Auth/RPZ区域XFR接受伪造的主机名 |
| CVE-2026-50046 | 5.9 MEDIUM | Bind 9 DoT转发查询被挤压时的堆使用后释放漏洞 |
| CVE-2026-55717 | 5.9 MEDIUM | 'serve-expired-client-timeout'与'response-ip' CNAME重定向可导致崩溃 |
| CVE-2026-55991 | 5.9 MEDIUM | libngtcp2 远程 DoQ 流控制断言失败漏洞 |
| CVE-2026-55990 | 5.9 MEDIUM | Unbound 1.10.1 DNSCrypt 配置不当导致拒绝服务漏洞 |
| CVE-2026-44621 | 5.9 MEDIUM | Libunbound 配置未请求回复阈值可能导致异常终止 |
| CVE-2026-52863 | 5.9 MEDIUM | 内存损坏可导致崩溃及拒绝服务漏洞 |
| CVE-2026-14586 | 5.9 MEDIUM | libngtcp2高并发DNS-over-QUIC环境下断言失败漏洞 |
| CVE-2026-56444 | 5.9 MEDIUM | BIND9 解析服务降级漏洞 |
| CVE-2026-50251 | 5.3 MEDIUM | 攻击者提供'0.0.0.0'/'::'触发防御性全局缓存刷新漏洞 |
| CVE-2026-50045 | 5.3 MEDIUM | DNSSEC 验证重启导致 'max-global-quota' 重置漏洞 |
| CVE-2026-56416 | 4.8 MEDIUM | 域名验证器可能因处理RDATA导致堆缓冲区溢出漏洞 |
| CVE-2026-42955 | 3.7 LOW | BIND 9 域名解析TTL控制漏洞 |
| CVE-2026-54478 | 3.7 LOW | DNS Cookie 绕过结合代理协议使用 |
| CVE-2026-46582 | 3.7 LOW | DNS服务器通配符重放导致缓存投毒漏洞 |
| CVE-2026-41637 | 3.7 LOW | DNS-over-QUIC查询处理不当导致服务降级 |
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IV. Related Vulnerabilities
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