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CVE-2026-93894

Vinyl Cache · denial of service

CVSS 4.0 2.3 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-93894

Published

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.).

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-93894

Published

Vinyl Cache

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "Vinyl Cache",
                    "vendor": "Vinyl-Cache",
                    "versions": [
                        {
                            "lessThan": "9.0.2",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "90f5bacc14b2404e6cc349ba015f0f73b8515136",
                            "status": "affected",
                            "version": "0",
                            "versionType": "git"
                        }
                    ]
                }

Varnish Cache

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "Varnish Cache",
                    "vendor": "Varnish-Software",
                    "versions": [
                        {
                            "lessThan": "9.0.4",
                            "status": "affected",
                            "version": "9.0.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "c5078ae575201b05ae8674a90ddb19ffe7f4b439",
                            "status": "affected",
                            "version": "0",
                            "versionType": "git"
                        },
                        {
                            "lessThanOrEqual": "8.0.2",
                            "status": "affected",
                            "version": "6.3.0",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON