CVE-2026-47691
Netty has Insufficient Bailiwick Validation for NS Records
描述
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). In `io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add` method accepts any NS record from the AUTHORITY section as long as the record's name is a suffix of the questionName. Subsequently, the `handleWithAdditional` method caches the associated A records from the ADDITIONAL section directly into the `authoritativeDnsServerCache` under the parent domain's key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain's key. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
如何修補 CVE-2026-47691
要修補 CVE-2026-47691,請將受影響套件升級到下列已修補版本。
- —未列出修補版本
- —升級至 4.2.15.Final 或更新版本
CVE-2026-47691 正在被利用嗎?
目前沒有被利用訊號。CVE-2026-47691 既不在 CISA KEV 也沒有最新的 EPSS 分數。
受影響套件(2)
- from 0
- >= 4.2.0.Final, < 4.2.15.Final
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N |