{"id":"UBUNTU-CVE-2026-93894","details":"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.).","modified":"2026-09-21T21:40:59.210122261Z","published":"2026-09-21T00:00:00Z","upstream":["CVE-2026-93894"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-93894"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-93894"},{"type":"REPORT","url":"https://vinyl-cache.org/security/VSV00020.html"}],"affected":[{"package":{"name":"varnish","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/varnish?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.4-1ubuntu1","3.0.4-1ubuntu2","3.0.5-1ubuntu2","3.0.5-2","3.0.5-2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libvarnishapi1","binary_version":"3.0.5-2ubuntu0.1"},{"binary_version":"3.0.5-2ubuntu0.1","binary_name":"varnish"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"}},{"package":{"name":"varnish","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/varnish?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.3-1","4.1.0-1","4.1.0-2","4.1.1-1","4.1.1-1ubuntu0.2","4.1.1-1ubuntu0.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.1.1-1ubuntu0.2+esm1","binary_name":"libvarnishapi1"},{"binary_name":"varnish","binary_version":"4.1.1-1ubuntu0.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"}},{"package":{"name":"varnish","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/varnish?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.0-7.1","5.2.1-1","5.2.1-1ubuntu0.1","5.2.1-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libvarnishapi1","binary_version":"5.2.1-1ubuntu0.1+esm1"},{"binary_name":"varnish","binary_version":"5.2.1-1ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"}},{"package":{"name":"varnish","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/varnish?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.1-1","6.2.1-2","6.2.1-2ubuntu0.1~esm1","6.2.1-2ubuntu0.1~esm2","6.2.1-2ubuntu0.1","6.2.1-2ubuntu0.2","6.2.1-2ubuntu0.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libvarnishapi2","binary_version":"6.2.1-2ubuntu0.2+esm1"},{"binary_name":"varnish","binary_version":"6.2.1-2ubuntu0.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"}},{"package":{"name":"varnish","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/varnish?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.5.2-1","6.6.1-1","6.6.1-1ubuntu0.2","6.6.1-1ubuntu0.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libvarnishapi2","binary_version":"6.6.1-1ubuntu0.2+esm1"},{"binary_name":"varnish","binary_version":"6.6.1-1ubuntu0.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"}},{"package":{"name":"varnish","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/varnish?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.1.1-1.1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libvarnishapi3","binary_version":"7.1.1-1.1ubuntu1"},{"binary_name":"varnish","binary_version":"7.1.1-1.1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"}},{"package":{"name":"varnish","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/varnish?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.7.3-1","7.7.3-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libvarnishapi3","binary_version":"7.7.3-1build1"},{"binary_name":"varnish","binary_version":"7.7.3-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93894.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}