{"id":"UBUNTU-CVE-2026-63209","details":"compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.","modified":"2026-10-01T00:21:35.044874775Z","published":"2026-09-29T15:17:00Z","upstream":["CVE-2026-63209"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-63209"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-63209"},{"type":"REPORT","url":"https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536"},{"type":"REPORT","url":"https://github.com/klauspost/compress/releases/tag/v1.18.7"},{"type":"REPORT","url":"https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw"}],"affected":[{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/golang-github-klauspost-compress?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20151221.0.2dd54ae-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.0~git20151221.0.2dd54ae-1","binary_name":"golang-github-klauspost-compress-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63209.json"}},{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/golang-github-klauspost-compress?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.1-1","1.2.1-2","1.2.1-4","1.2.1-5"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2.1-5","binary_name":"golang-github-klauspost-compress-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63209.json"}},{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/golang-github-klauspost-compress?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.1-5","1.7.6-2","1.9.5-1","1.9.5-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.9.5-2","binary_name":"golang-github-klauspost-compress-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63209.json"}},{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/golang-github-klauspost-compress?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.7-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.11.7-2","binary_name":"golang-github-klauspost-compress-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63209.json"}},{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/golang-github-klauspost-compress?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.12+ds1-3","1.17.7+ds1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-klauspost-compress-dev","binary_version":"1.17.7+ds1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63209.json"}},{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/golang-github-klauspost-compress?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.0+ds1-1","1.18.1+ds1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-klauspost-compress-dev","binary_version":"1.18.1+ds1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63209.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}