CVE-2026-87018— undici 拒绝服务漏洞（TLS 1.2 证书变更重协商）
一分钟漏洞结论
影响对象
undici undici
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。
undici 是 Node.js 的 HTTP 客户端库。在以下版本中：4.2.1 至 6.29.0、7.0.0 至 7.30.0、以及 8.0.0 至 8.12.1，当 TLS 1.2 服务器在连接建立后发起重新协商（renegotiation），并提供一个不同但由受信任的 CA 签发的证书，且该证书的主机名（hostname）与请求的主机不匹配时，客户端进程会发生崩溃。 Node.js 会在重新协商过程中重新执行主机名验证，若验证失败，则会销毁 socket 并抛出“certificate-altname”错误
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一、 漏洞 CVE-2026-87018 基础信息
漏洞信息
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Vulnerability Title
undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation
来源: CVE Program / CVE List V5
Vulnerability Description
undici is an HTTP client library for Node.js. In versions 4.2.1 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, the client process crashes when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does not match the requested host. Node.js re-runs hostname verification on the renegotiated handshake and destroys the socket with a certificate-altname error, but undici's established-socket error handler asserted that this error code could never occur, so the peer-controlled error became an uncaught assertion that terminates the Node.js process, affecting both the HTTP/1.1 and HTTP/2 paths. A malicious or compromised HTTPS endpoint reached through undici or the global fetch() can crash the client with a single server-initiated renegotiation, taking down all in-flight requests and background work in the process, and exploitation needs no CA compromise because the attacker controls the endpoint and can present two ordinary valid certificates. Only TLS 1.2 is affected, since TLS 1.3 does not support renegotiation. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. As a workaround, restrict outbound connections to TLS 1.3 so renegotiation cannot occur, when the target endpoints support it.
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:H
来源: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-87018 的公开POC
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CVE-2026-87018 其他参考 (1)
同批安全公告 · undici · 2026-10-15 · 共 9 条
| CVE-2026-109855 | 7.5 HIGH | undici WebSocket 客户端拒绝服务漏洞 |
| CVE-2026-109869 | 7.5 HIGH | undici 拒绝服务漏洞 |
| CVE-2026-109383 | 7.4 HIGH | undici TLS证书验证绕过漏洞 |
| CVE-2026-109829 | 7.4 HIGH | undici 缓存投毒和跨用户披露漏洞 |
| CVE-2026-87029 | 5.9 MEDIUM | undici 拒绝服务漏洞：解压缩拦截器未处理异常 |
| CVE-2026-109932 | 5.9 MEDIUM | undici WebSocket 客户端拒绝服务漏洞 |
| CVE-2026-109841 | 5.9 MEDIUM | undici 子资源完整性绕过漏洞 |
| CVE-2026-109924 | 5.9 MEDIUM | undici EventSource解析器拒绝服务漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-87018
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