{"schemaVersion":3,"id":"CVE-2026-93894","aliases":["UBUNTU-CVE-2026-93894","DEBIAN-CVE-2026-93894"],"status":"published","duplicateOf":null,"title":null,"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.).","dates":{"published":"2026-09-18T20:30:04.646Z","modified":"2026-09-19T14:01:28.211Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":2.3,"severity":"low","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":2.3,"severity":"low","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":2.3,"severity":"low","vector":"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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":2.3,"severity":"low","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:A/V:D/RE:L/U:Clear","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":2.3,"severity":"low","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:A/V:D/RE:L/U:Clear","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00358,"percentile":0.28119,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.10799999999999998,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.0025},"history":[{"date":"2026-09-19T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00358,"percentile":0.28119}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0025,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00358,"percentile":0.28119}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"debian","product":"varnish","name":"varnish","label":"varnish","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/varnish","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"debian","product":"vinyl-cache","name":"vinyl-cache","label":"vinyl-cache","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/vinyl-cache","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"varnish","name":"varnish","label":"varnish","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/varnish","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"vinyl-cache","name":"vinyl-cache","label":"vinyl-cache","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/vinyl-cache","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"varnish-software","product":"varnish_cache","name":"varnish cache","label":"varnish_cache","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 9.0.0, < 9.0.4","noFixRecorded":false,"fixedIn":null},{"text":"< c5078ae575201b05ae8674a90ddb19ffe7f4b439","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.3.0, ≤ 8.0.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.0.0, < 9.0.4 | < c5078ae575201b05ae8674a90ddb19ffe7f4b439 | ≥ 6.3.0, ≤ 8.0.2","eol":null,"hubHref":"/vendor/varnish-software/varnish_cache"},{"vendor":"vinyl-cache","product":"vinyl_cache","name":"vinyl cache","label":"vinyl_cache","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 9.0.2","noFixRecorded":false,"fixedIn":null},{"text":"< 90f5bacc14b2404e6cc349ba015f0f73b8515136","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 9.0.2 | < 90f5bacc14b2404e6cc349ba015f0f73b8515136","eol":null,"hubHref":"/vendor/vinyl-cache/vinyl_cache"}],"affectedCount":6,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://vinyl-cache.org/security/VSV00020.html","label":"vinyl-cache.org/security/VSV00020.html","hostname":"vinyl-cache.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-93894","label":"ubuntu.com/security/CVE-2026-93894","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93894","label":"www.cve.org/CVERecord?id=CVE-2026-93894","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93894","label":"security-tracker.debian.org/tracker/CVE-2026-93894","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-18T20:30:04.646Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-19T14:01:28.211Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":9,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T18:50:56.891Z","stale":false,"partial":false}}