CVE-2026-44621— NLnet Labs Unbound 异常处理不当漏洞
可能的 ATT&CK 技术 1AI
T1499 · Endpoint Denial of Service影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| NLnet Labs | Unbound | < 1.25.2 | affected |
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一、 漏洞 CVE-2026-44621 基础信息
漏洞信息
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Vulnerability Title
Libunbound applications configured with 'unwanted-reply-threshold' could eventually be abruptly terminated
来源: CVE Program / CVE List V5
Vulnerability Description
With NLnet Labs Unbound up to and including version 1.25.1, applications using libunbound and configured with 'unwanted-reply-threshold', could eventually be abruptly terminated if the threshold is reached and libunbound needs to call 'libworker_alloc_cleanup' since the function is absent from the function call allow list. When an application using libunbound sets 'unwanted-reply-threshold' to any non-zero value and the iterator queries an authoritative that replies with enough wrong-transaction-ID UDP datagrams to cross the threshold, the 'libworker_alloc_cleanup' will eventually be called. Since the function is absent from the function call allow list, this leads to a fatal exit of libunbound and eventual termination of the embedding application.Unbound itself is not affected since its relevant function 'worker_alloc_cleanup' is registed in the allow list and proceeds to perform the documented cache flush.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
来源: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Unbound 异常处理不当漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
NLnet Labs Unbound是荷兰NLnet Labs组织的域名系统解析服务器。 NLnet Labs Unbound 1.25.1及之前版本存在异常处理不当漏洞，该漏洞源于libunbound中'libworker_alloc_cleanup'函数未被列入函数调用允许列表，当应用程序配置了'unwanted-reply-threshold'且阈值被达到时，可能导致libunbound致命退出，进而导致嵌入应用程序终止。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| NLnet Labs | Unbound | 0 ~ 1.25.2 | - |
二、漏洞 CVE-2026-44621 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-44621 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 | NLnet Labs Unbound 输入验证错误漏洞 |
| CVE-2026-44690 | 7.5 HIGH | NLnet Labs Unbound 输入验证错误漏洞 |
| CVE-2026-32665 | 7.5 HIGH | NLnet Labs Unbound 输入验证错误漏洞 |
| CVE-2026-40691 | 7.5 HIGH | NLnet Labs Unbound 缓冲区错误漏洞 |
| CVE-2026-50248 | 6.5 MEDIUM | NLnet Labs Unbound 输入验证错误漏洞 |
| CVE-2026-50046 | 5.9 MEDIUM | NLnet Labs Unbound 资源管理错误漏洞 |
| CVE-2026-55717 | 5.9 MEDIUM | NLnet Labs Unbound 异常处理不当漏洞 |
| CVE-2026-55991 | 5.9 MEDIUM | NLnet Labs Unbound 数字错误漏洞 |
| CVE-2026-55990 | 5.9 MEDIUM | NLnet Labs Unbound 异常处理不当漏洞 |
| CVE-2026-52863 | 5.9 MEDIUM | NLnet Labs Unbound 资源管理错误漏洞 |
| CVE-2026-56444 | 5.9 MEDIUM | NLnet Labs Unbound 资源管理错误漏洞 |
| CVE-2026-14586 | 5.9 MEDIUM | NLnet Labs Unbound 异常处理不当漏洞 |
| CVE-2026-50251 | 5.3 MEDIUM | NLnet Labs Unbound 输入验证错误漏洞 |
| CVE-2026-50045 | 5.3 MEDIUM | NLnet Labs Unbound 资源管理错误漏洞 |
| CVE-2026-56416 | 4.8 MEDIUM | NLnet Labs Unbound 加密问题漏洞 |
| CVE-2026-44687 | 3.7 LOW | NLnet Labs Unbound 数字错误漏洞 |
| CVE-2026-42955 | 3.7 LOW | NLnet Labs Unbound 资源管理错误漏洞 |
| CVE-2026-54478 | 3.7 LOW | NLnet Labs Unbound 授权问题漏洞 |
| CVE-2026-46582 | 3.7 LOW | NLnet Labs Unbound 处理逻辑错误漏洞 |
| CVE-2026-41637 | 3.7 LOW | NLnet Labs Unbound 资源管理错误漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-44621
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