{"id":"USN-8733-2","summary":"gzip vulnerabilities","details":"USN-8733-1 fixed vulnerabilities in Gzip. This update provides the\ncorresponding fix for Gzip on Ubuntu 14.04 LTS, Ubuntu 18.04 LTS and Ubuntu\n20.04 LTS.\n\nOriginal advisory details:\n\n Michał Majchrowicz and Marcin Wyczechowski discovered that Gzip's gzexe\nutility created temporary files in an insecure manner when mktemp was\nunavailable. A local attacker could possibly use this issue to overwrite\narbitrary files. (CVE-2026-41991)\n\n Elias Hasas, Michał Majchrowicz and Marcin Wyczechowski discovered that\nGzip incorrectly handled certain compressed files. An attacker could\npossibly use this issue to obtain sensitive information or cause Gzip to\ncrash, resulting in a denial of service. (CVE-2026-41992)","modified":"2026-09-23T18:57:40.680939669Z","published":"2026-09-22T16:04:21Z","related":["UBUNTU-CVE-2026-41991","UBUNTU-CVE-2026-41992"],"upstream":["CVE-2026-41991","CVE-2026-41992","UBUNTU-CVE-2026-41991","UBUNTU-CVE-2026-41992"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8733-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41991"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41992"}],"affected":[{"package":{"name":"gzip","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/gzip?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6-3ubuntu1+esm2"}]}],"versions":["1.6-2ubuntu1","1.6-3ubuntu1","1.6-3ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"gzip","binary_version":"1.6-3ubuntu1+esm2"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-41991"},{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-41992"}],"ecosystem":"Ubuntu:Pro:14.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8733-2.json"}},{"package":{"name":"gzip","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/gzip?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6-5ubuntu1.2+esm1"}]}],"versions":["1.6-5ubuntu1","1.6-5ubuntu1.1","1.6-5ubuntu1.2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"gzip","binary_version":"1.6-5ubuntu1.2+esm1"},{"binary_name":"gzip-win32","binary_version":"1.6-5ubuntu1.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8733-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-41991"},{"id":"CVE-2026-41992","severity":[{"score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}]}}},{"package":{"name":"gzip","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/gzip?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10-0ubuntu4.1+esm1"}]}],"versions":["1.10-0ubuntu3","1.10-0ubuntu4","1.10-0ubuntu4.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"1.10-0ubuntu4.1+esm1","binary_name":"gzip"},{"binary_version":"1.10-0ubuntu4.1+esm1","binary_name":"gzip-win32"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-41991","severity":[{"score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-41992"}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8733-2.json"}}],"schema_version":"1.9.0"}