CVE-2026-40395— Varnish Enterprise 安全漏洞

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Varnish Enterprise before 6.0.16r12 allows a "workspace overflow" denial of service (daemon panic) for shared VCL. The headerplus.write_req0() function from vmod_headerplus updates the underlying req0, which is normally the original read-only request from which req is derived (readable and writable from VCL). This is useful in the active VCL, after amending req, to prepare a refined req0 before switching to a different VCL with the return (vcl(<label>)) action. This is for example how the Varnish Controller operates shared VCL deployments. If the amended req contained too many header fields for req0, this would have resulted in a workspace overflow that would in turn trigger a panic and crash the Varnish Enterprise server. This could be used as a Denial of Service attack vector by malicious clients.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L

不加限制或调节的资源分配

Varnish Enterprise 安全漏洞

Varnish Enterprise是Varnish公司的一款高性能的缓存软件。用于处理高流量、优化业务。 Varnish Enterprise 6.0.16r12之前版本存在安全漏洞，该漏洞源于共享VCL中headerplus.write_req0函数更新底层req0时，如果修改后的req包含过多标头字段，可能导致工作空间溢出拒绝服务。

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