{"id":"DEBIAN-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":"2026-10-01T08:47:34.474903824Z","published":"2026-09-29T15:17:27.130Z","upstream":["CVE-2026-63209"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-63209"}],"affected":[{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Debian:12","purl":"pkg:deb/debian/golang-github-klauspost-compress?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.12+ds1-3","1.17.0+ds1-1","1.17.0+ds1-1~exp1","1.17.10+ds1-1","1.17.11+ds1-1","1.17.2+ds1-1","1.17.7+ds1-1","1.17.9+ds1-1","1.17.9+ds1-1~bpo12+1","1.18.0+ds1-1","1.18.1+ds1-1","1.18.6+ds1-1","1.18.6+ds1-2","1.19.0+ds1-1","1.19.0+ds1-2","1.20.0+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63209.json"}},{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Debian:13","purl":"pkg:deb/debian/golang-github-klauspost-compress?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.0+ds1-1","1.18.1+ds1-1","1.18.6+ds1-1","1.18.6+ds1-2","1.19.0+ds1-1","1.19.0+ds1-2","1.20.0+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63209.json"}},{"package":{"name":"golang-github-klauspost-compress","ecosystem":"Debian:14","purl":"pkg:deb/debian/golang-github-klauspost-compress?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.0+ds1-1"}]}],"versions":["1.18.0+ds1-1","1.18.1+ds1-1","1.18.6+ds1-1","1.18.6+ds1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-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"}]}