{"schemaVersion":3,"id":"CVE-2026-17591","aliases":["DEBIAN-CVE-2026-17591","RHSA-2026:77775"],"status":"published","duplicateOf":null,"title":null,"description":"A flaw was found in libarchive. An attacker can cause a Denial of Service (DoS) or potential information disclosure due to a use-after-free vulnerability, which occurs when a program reads memory that has already been released. This issue arises when the archive_entry_copy_mac_metadata() function deallocates an internal buffer before completing a data copy. An attacker who can supply input to an application utilizing this function can trigger the flaw to crash the application or read uninitialized memory data.","dates":{"published":"2026-10-16T22:03:40.603Z","modified":"2026-10-19T21:28:22.621Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":3.6,"severity":"low","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":3.6,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":3.6,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Red hat","score":3.6,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L","exploitability":2.6,"impact":4.2,"computed":true}]},"epss":{"probability":0.0011,"percentile":0.0122,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-17T00:00:00.000Z","score":0.00109,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0011,"percentile":0.0122}],"last30":[{"date":"2026-10-17T00:00:00.000Z","score":0.00109,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0011,"percentile":0.0122}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-416","name":"Use After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"debian","product":"libarchive","name":"libarchive","label":"libarchive","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libarchive","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 3.8.9-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 3.8.9-1","eol":null,"hubHref":null},{"vendor":"redhat","product":"bsdcat","name":"bsdcat","label":"bsdcat","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/bsdcat","purlType":"rpm","versions":[{"text":"< 0:3.8.9-2.1.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:3.8.9-2.1.hum1","eol":null,"hubHref":null},{"vendor":"redhat","product":"bsdcpio","name":"bsdcpio","label":"bsdcpio","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/bsdcpio","purlType":"rpm","versions":[{"text":"< 0:3.8.9-2.1.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:3.8.9-2.1.hum1","eol":null,"hubHref":null},{"vendor":"redhat","product":"bsdtar","name":"bsdtar","label":"bsdtar","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/bsdtar","purlType":"rpm","versions":[{"text":"< 0:3.8.9-2.1.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:3.8.9-2.1.hum1","eol":null,"hubHref":null},{"vendor":"redhat","product":"bsdunzip","name":"bsdunzip","label":"bsdunzip","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/bsdunzip","purlType":"rpm","versions":[{"text":"< 0:3.8.9-2.1.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:3.8.9-2.1.hum1","eol":null,"hubHref":null},{"vendor":"redhat","product":"libarchive","name":"libarchive","label":"libarchive","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/libarchive","purlType":"rpm","versions":[{"text":"< 0:3.8.9-2.1.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:3.8.9-2.1.hum1","eol":null,"hubHref":null},{"vendor":"redhat","product":"libarchive-devel","name":"libarchive-devel","label":"libarchive-devel","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/libarchive-devel","purlType":"rpm","versions":[{"text":"< 0:3.8.9-2.1.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:3.8.9-2.1.hum1","eol":null,"hubHref":null}],"affectedCount":7,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-17591","label":"access.redhat.com/security/cve/CVE-2026-17591","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","REPORT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554209","label":"bugzilla.redhat.com/show_bug.cgi?id=2554209","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT","REPORT"]},{"url":"https://github.com/libarchive/libarchive/pull/3318","label":"github.com/libarchive/libarchive/pull/3318","hostname":"github.com","tags":["ARTICLE"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-17591","label":"security-tracker.debian.org/tracker/CVE-2026-17591","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:77775","label":"access.redhat.com/errata/RHSA-2026:77775","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT","Advisory"]},{"url":"https://images.redhat.com/","label":"images.redhat.com","hostname":"images.redhat.com","tags":["ARTICLE"]},{"url":"https://access.redhat.com/security/updates/classification/","label":"access.redhat.com/security/updates/classification/","hostname":"access.redhat.com","tags":["ARTICLE"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_77775.json","label":"security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_77775.json","hostname":"security.access.redhat.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-17591","label":"www.cve.org/CVERecord?id=CVE-2026-17591","hostname":"www.cve.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17591","label":"nvd.nist.gov/vuln/detail/CVE-2026-17591","hostname":"nvd.nist.gov","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-16T22:03:40.603Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-19T21:28:22.621Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":14,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T08:43:41.313Z","stale":false,"partial":false}}