CVE-2026-82720— DoH 流清理代码路径使用后再释放漏洞
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 1.12.0 up to and including 1.26.0 has a use-after-free vulnerability when compiled for DNS-over-HTTPs support with '--with-libnghttp2'. During failure code paths (i.e., RPZ drop query, jostle due to heavy traffic), a dropped DoH stream bring
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一、 漏洞 CVE-2026-82720 基础信息
漏洞信息
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Vulnerability Title
Use-after-free in DoH stream cleanup code path
来源: CVE Program / CVE List V5
Vulnerability Description
NLnet Labs Unbound 1.12.0 up to and including 1.26.0 has a use-after-free vulnerability when compiled for DNS-over-HTTPs support with '--with-libnghttp2'. During failure code paths (i.e., RPZ drop query, jostle due to heavy traffic), a dropped DoH stream brings down the whole DoH session and does not account properly for other DoH streams in the same session. This leads to use-after-free in those code paths. If the prerequisites are satisfied (possible RPZ drop or heavy client traffic), a malicious actor can trigger the vulnerability with a single DoH connection and the appropriate traffic. Impact is limited as the reads are not user controlled and the use-after-free leads to early returns. However, a hardened allocator can catch the use-after-free and controllably terminate the process resulting to denial of service.
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:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
释放后使用
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 | 1.12.0 ~ 1.26.1 | - |
|
二、漏洞 CVE-2026-82720 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-82720 其他参考 (1)
-
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-82720.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-2026-85501 | 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-2026-82720
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