{"id":"UBUNTU-CVE-2026-22184","details":"zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.","modified":"2026-09-11T15:00:13.464140426Z","published":"2026-01-07T21:16:00Z","upstream":["CVE-2026-22184"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-22184"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-22184"},{"type":"REPORT","url":"https://github.com/madler/zlib"},{"type":"REPORT","url":"https://seclists.org/fulldisclosure/2026/Jan/3"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname"},{"type":"REPORT","url":"https://zlib.net/"}],"affected":[{"package":{"name":"zsync","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/zsync?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.2-1ubuntu1","binary_name":"zsync"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-22184.json"}},{"package":{"name":"zsync","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/zsync?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2-2ubuntu1","0.6.2-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"zsync","binary_version":"0.6.2-3ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-22184.json"}},{"package":{"name":"zsync","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/zsync?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"zsync","binary_version":"0.6.2-3ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-22184.json"}},{"package":{"name":"zsync","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/zsync?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.2-3ubuntu1","binary_name":"zsync"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-22184.json"}},{"package":{"name":"zsync","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/zsync?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2-5","0.6.2-5build1"],"ecosystem_specific":{"binaries":[{"binary_name":"zsync","binary_version":"0.6.2-5build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-22184.json"}},{"package":{"name":"zsync","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/zsync?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2-7ubuntu1","0.6.2-8"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.2-8","binary_name":"zsync"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-22184.json"}},{"package":{"name":"zsync","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/zsync?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2-8","0.6.2-9"],"ecosystem_specific":{"binaries":[{"binary_name":"zsync","binary_version":"0.6.2-9"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-22184.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}