{"schemaVersion":3,"id":"CVE-2026-16517","aliases":["UBUNTU-CVE-2026-16517","USN-8902-1","DEBIAN-CVE-2026-16517"],"status":"published","duplicateOf":null,"title":null,"description":"A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.","dates":{"published":"2026-07-21T22:41:38.128Z","modified":"2026-09-21T23:39:07.381Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":2.9,"severity":"low","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":2.9,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":2.9,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":3.6,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"}],"affected":[{"vendor":"debian","product":"libarchive","name":"libarchive","label":"libarchive","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libarchive","purlType":"deb","versions":[{"text":"< 3.6.2-1+deb12u5","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 3.8.9-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.2-1+deb12u5 | All versions (No fix recorded) | < 3.8.9-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libarchive","name":"libarchive","label":"libarchive","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libarchive","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 3.6.0-1ubuntu1.9","noFixRecorded":false,"fixedIn":null},{"text":"< 3.7.2-2ubuntu0.9","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.5-1ubuntu2.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 3.6.0-1ubuntu1.9 | < 3.7.2-2ubuntu0.9 | < 3.8.5-1ubuntu2.3","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:43818","label":"access.redhat.com/errata/RHSA-2026:43818","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:69553","label":"access.redhat.com/errata/RHSA-2026:69553","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-16517","label":"access.redhat.com/security/cve/CVE-2026-16517","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2505492","label":"bugzilla.redhat.com/show_bug.cgi?id=2505492","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]},{"url":"https://ubuntu.com/security/CVE-2026-16517","label":"ubuntu.com/security/CVE-2026-16517","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-16517","label":"www.cve.org/CVERecord?id=CVE-2026-16517","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8902-1","label":"ubuntu.com/security/notices/USN-8902-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-16517","label":"security-tracker.debian.org/tracker/CVE-2026-16517","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:43818","RHSA-2026:69553"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-07-21T22:41:38.128Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-21T23:39:07.381Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":12,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T21:22:30.330Z","stale":false,"partial":false}}