CVE-2026-82717— CNAME合成导致堆内存损坏漏洞
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。
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems and compilation options could lead to remote code execution. The vulnerability starts when CNAME synthesis durin
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一、 漏洞 CVE-2026-82717 基础信息
漏洞信息
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Vulnerability Title
CNAME synthesis could lead to heap corruption
来源: CVE Program / CVE List V5
Vulnerability Description
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems and compilation options could lead to remote code execution. The vulnerability starts when CNAME synthesis during an upstream response needs to enforce(rewrite) a max TTL value in the packet buffer. Coupled with a compression pointer that points to the overwritten value and invalidates the domain name, it leads to an error path that does not properly move the buffer position and allows for the heap buffer overflow. Since this is heavily reliant on heap memory layout, results are memory corruption that eventually leads to a crash and under specific systems and compilation options remote code execution.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U
来源: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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-2026-82717 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-82717 其他参考 (1)
-
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-82717.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-2026-81634 | 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-2026-85501 | 5.3 MEDIUM | DNSSEC算法复杂度攻击漏洞 |
| 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-2026-82717
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