CVE-2026-46582— NLnet Labs Unbound 处理逻辑错误漏洞
一分钟漏洞结论
影响对象
NLnet Labs Unbound
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
NLnet Labs Unbound是荷兰NLnet Labs组织的域名系统解析服务器。 NLnet Labs Unbound 1.6.0版本至1.25.1版本存在处理逻辑错误漏洞，该漏洞源于对泛域名RRset的重放处理不当，可能导致攻击者通过DNSSEC签名的域名和CNAME包装记录，利用serve expired路径将注入的泛域名RRset缓存为安全状态，从而更改特定记录。
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| NLnet Labs | Unbound | 1.6.0< 1.25.2 |
affected |
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一、 漏洞 CVE-2026-46582 基础信息
漏洞信息
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Vulnerability Title
A wildcard replay, as another piece of data, triggers poisoning in the serve expired reply path
来源: CVE Program / CVE List V5
Vulnerability Description
In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, a replay of a wildcard rrset as another piece of data, could be briefly considered DNSSEC secure based only on the RRSIG validation and stored into cache, before later validation treats it as bogus based on NSEC validation. When the resolving thread puts secure on the rrset, and another thread that is on the serve expired path then picks up the updated rrset contents with the secure status for a reply, it can be used to change a specific record, next to a wildcard that could be covered by the wildcard, into the wildcard. A malicious actor can exploit the possible poisonous effect by having any DNSSEC-singed domain (irrelevant to the victim domain) and a CNAME wrapper record that points to a record next to a wildcard (that could be covered by the wildcard). Then quering Unbound for the wildcard sibling record would seed the secure message. A later (after expiry) query for the CNAME wrapper would need to resolve the target sibling record. If the wildcard replay is injected into the response, the wildcard rrset will update the expired sibling record with a secure status before completing proper wildcard validation with NSEC records and eventually treating the CNAME wrapper answer as bogus. The updated poisoned rrset is now secure and points to the wildcard. This vulnerability is explicit for the serve expired path and needs injection of the signed wildcard rrset without the NSEC accompanying rrset.
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:L/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
不恰当实现的标准安全检查
来源: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Unbound 处理逻辑错误漏洞
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 1.6.0版本至1.25.1版本存在处理逻辑错误漏洞，该漏洞源于对泛域名RRset的重放处理不当，可能导致攻击者通过DNSSEC签名的域名和CNAME包装记录，利用serve expired路径将注入的泛域名RRset缓存为安全状态，从而更改特定记录。
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 | 1.6.0 ~ 1.25.2 | - |
|
二、漏洞 CVE-2026-46582 的公开POC
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|---|
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CVE-2026-46582 厂商安全公告 (1)
-
🔗 https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-46582.txt vendor-advisory
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-2026-44621 | 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-2026-55990 | 5.9 MEDIUM | NLnet Labs Unbound 异常处理不当漏洞 |
| CVE-2026-14586 | 5.9 MEDIUM | NLnet Labs Unbound 异常处理不当漏洞 |
| CVE-2026-56444 | 5.9 MEDIUM | NLnet Labs Unbound 资源管理错误漏洞 |
| 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-2026-41637 | 3.7 LOW | NLnet Labs Unbound 资源管理错误漏洞 |
显示前 20 条，共 24 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-46582
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