CVE-2026-42534— NLnet Labs Unbound 安全漏洞
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NLnet Labs开源的一个高性能DNS解析器。 NLnet Labs Unbound 1.25.0及之前版本存在安全漏洞，该漏洞源于jostle逻辑中重复查询的时间戳更新问题，可能导致慢查询无法被替换，攻击者通过控制慢速或恶意响应的域名服务器可降低Unbound的解析性能。
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| NLnet Labs | Unbound | < 1.25.1 |
affected |
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一、 漏洞 CVE-2026-42534 基础信息
漏洞信息
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Vulnerability Title
Jostle logic bypass degrades resolution performance
来源: CVE Program / CVE List V5
Vulnerability Description
NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/U:Amber
来源: CVE Program / CVE List V5
Vulnerability Type
预期行为违背
来源: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Unbound 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
NLnet Labs Unbound是NLnet Labs开源的一个高性能DNS解析器。 NLnet Labs Unbound 1.25.0及之前版本存在安全漏洞，该漏洞源于jostle逻辑中重复查询的时间戳更新问题，可能导致慢查询无法被替换，攻击者通过控制慢速或恶意响应的域名服务器可降低Unbound的解析性能。
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 ~ 1.25.1 | - |
|
二、漏洞 CVE-2026-42534 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-42534 其他参考 (1)
-
🔗 https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt vendor-advisory
同批安全公告 · NLnet Labs · 2026-05-20 · 共 11 条
| CVE-2026-33278 | 9.1 CRITICAL | NLnet Labs Unbound 资源管理错误漏洞 |
| CVE-2026-42959 | 8.7 HIGH | NLnet Labs Unbound 缓冲区错误漏洞 |
| CVE-2026-42944 | 8.7 HIGH | NLnet Labs Unbound 安全漏洞 |
| CVE-2026-44390 | 6.9 MEDIUM | NLnet Labs Unbound 安全漏洞 |
| CVE-2026-41292 | 6.6 MEDIUM | NLnet Labs Unbound 安全漏洞 |
| CVE-2026-42923 | NLnet Labs Unbound 安全漏洞 | |
| CVE-2026-42960 | NLnet Labs Unbound 安全漏洞 | |
| CVE-2026-32792 | NLnet Labs Unbound 缓冲区错误漏洞 | |
| CVE-2026-40622 | NLnet Labs Unbound 访问控制错误漏洞 | |
| CVE-2026-44608 | NLnet Labs Unbound 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-42534
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