CVE-2026-93894
LowCVSS 2.3Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
In Vinyl Cache before 9.0.2, a workspace buffer overflow vulnerability exists in the .upper() and .lower() string methods of VCL. It can be used as a remote denial of service vector causing the child process to segfault or assert and restart.
Risk Assessment
Effective exploitation requires prior knowledge of the VCL in use and the ability to craft a request with a sufficiently long string, potentially leading to denial of service.
Recommendation
Upgrade Vinyl Cache to version 9.0.2 or later, which fixes the workspace buffer overflow.
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Original NVD description (English source)
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.).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

