CVE-2026-44390— 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，该漏洞源于处理大型RRset时名称压缩操作未绑定，可能导致性能下降和拒绝服务。
可能的 ATT&CK 技术 1 AI
T1498.002 · Reflection Amplification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-2026-44390 基础信息
漏洞信息
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Vulnerability Title
Unbounded name compression in certain cases causes degradation of service
来源: CVE Program / CVE List V5
Vulnerability Description
NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability when handling replies with very large RRsets that Unbound needs to perform name compression for. Malicious upstream responses with very large RRsets with records that don't share a suffix above the root can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. An adversary can exploit the vulnerability by querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. A compression limit was introduced in 1.21.1 for this but it didn't account for the case where records would not share any suffix above the root. That causes Unbound to go in a different code path because of the compression tree lookup failure and eventually not increment the compression counter for those operations. Unbound 1.25.1 contains a patch with a fix that increments the compression counter regardless of the compression tree lookup. This is a complement fix to CVE-2024-8508.
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
算法复杂性
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，该漏洞源于处理大型RRset时名称压缩操作未绑定，可能导致性能下降和拒绝服务。
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-2026-44390 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-44390 厂商安全公告 (1)
-
🔗 https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44390.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-2026-42534 | 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-2026-44390
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