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CVE-2026-93894

Quick assessment

Affected
Vinyl-Cache Vinyl Cache
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 9.0 之前的 Vinyl Cache 中，VCL 中字符串类型的 和 方法被发现在工作区存在缓冲区溢出漏洞。该漏洞可被用作远程拒绝服务（DoS）攻击向量，导致子进程发生段错误（segfault）或断言失败（assert）后重启。要有效利用此漏洞，攻击者需事先了解所使用的 VCL 内容，并能够构造一个包含足够长字符串的请求，以在调用点处填满剩余的工作区空间，同时使该请求保持在各种请求大小限制（如 、 等）之内。

CVSS 2.3 · Low

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-93894

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper() and .lower() string type methods of VCL. This can be used as a remote denial of service (DoS) vector to make the child process segfault or assert, and then restart. Effectively exploiting this vulnerability requires prior knowledge about the VCL in use and the ability to craft a request that contains a string that is long enough to fill the remaining workspace at the call site while staying under the different request size limits (http_req_size, http_req_hdr_len, etc.).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:N/R:A/V:D/RE:L/U:Clear
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Vinyl-Cache Vinyl Cache 0 ~ 9.0.2 -
Varnish-Software Varnish Cache 9.0.0 ~ 9.0.4 -

II. Public POCs for CVE-2026-93894

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III. Intelligence Information for CVE-2026-93894

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Other References for CVE-2026-93894 (1)

IV. Related Vulnerabilities

Same product: Vinyl Cache
Same weakness: CWE-787

V. Comments for CVE-2026-93894

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