CVE-2026-85501— DNSSEC算法复杂度攻击漏洞
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。
Novel vulnerabilities to launch algorithmic complexity attacks on DNSSEC have been researched under the term 'ReTrap'. These result in degradation of service when malicious zones are used to serve the algorithmic complexity vulnerabilities. NLnet Labs Unbound
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一、 漏洞 CVE-2026-85501 基础信息
漏洞信息
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Vulnerability Title
Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC
来源: CVE Program / CVE List V5
Vulnerability Description
Novel vulnerabilities to launch algorithmic complexity attacks on DNSSEC have been researched under the term 'ReTrap'. These result in degradation of service when malicious zones are used to serve the algorithmic complexity vulnerabilities. NLnet Labs Unbound up to and including 1.26.0 is vulnerable to some of them. TagTrap, where the triple(Zone, Algo, KeyTag) matching mechanism introduces a significant attack vector when resolvers handle malicious responses containing numerous mismatched DNSKEY, RRSIG, and DS record. DelegationTrap, where constructing the chain-of-trust requires iterative validation of DNSKEY and DS records from the root zone downward. For deeply nested domains, this results in significant computational overhead. NsecTrap, where responses with excessive invalid NSEC records compel the resolver to validate each one. AdditionalTrap, where Unbound by default would try to DNSSEC validate the ADDITIONAL section as well. This can be exploited to waste validation resources by malicious users.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| NLnet Labs | Unbound | 0 ~ 1.26.1 | - |
|
二、漏洞 CVE-2026-85501 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-85501 其他参考 (1)
-
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-85501.txt vendor-advisory
同批安全公告 · NLnet Labs · 2026-09-16 · 共 9 条
| CVE-2026-81642 | 9.1 CRITICAL | DNSKEY 摘要堆缓冲区溢出导致远程代码执行漏洞 |
| CVE-2026-82717 | 8.4 HIGH | CNAME合成导致堆内存损坏漏洞 |
| CVE-2026-81634 | 7.5 HIGH | DNSSEC规范化过程中堆缓冲区溢出漏洞 |
| CVE-2026-78227 | 6.5 MEDIUM | DoQ 流重置重传中的释放后使用漏洞 |
| CVE-2026-82720 | 5.9 MEDIUM | DoH 流清理代码路径使用后再释放漏洞 |
| CVE-2026-80225 | 5.3 MEDIUM | TCP/DoT 持续查询导致服务性能下降 |
| CVE-2026-77955 | 4.4 MEDIUM | ZONEMD验证绕过窗口 |
| CVE-2026-77860 | 3.7 LOW | Unbound serve-expired 绕过 wait-limit 漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-85501
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