{"id":"UBUNTU-CVE-2026-110598","details":"Libyal libpff through 20260926 contains an integer underflow in libpff_record_entry_get_multi_value() that allows attackers to trigger heap out-of-bounds reads via non-monotonic multi-value offsets. Attackers can craft PST, OST or PAB files with decreasing PT_MV_STRING8, PT_MV_UNICODE or PT_MV_BINARY offsets to crash libpff, pypff or pffexport and expose adjacent heap memory.","modified":"2026-10-17T12:59:52.064661299Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-110598"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-110598"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-110598"},{"type":"REPORT","url":"https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_multi_value.c#L207-L271"},{"type":"REPORT","url":"https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_record_entry.c#L2825-L2874"},{"type":"REPORT","url":"https://hackmd.io/@haind-pwn/libpff-multivalue-offset-underflow-oob-read"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/libyal-libpff-through-20260926-heap-out-of-bounds-read-via-libpff-record-entry-get-multi-value"}],"affected":[{"package":{"name":"libpff","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libpff?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20120802-5"],"ecosystem_specific":{"binaries":[{"binary_name":"libpff1","binary_version":"20120802-5"},{"binary_version":"20120802-5","binary_name":"pff-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110598.json"}},{"package":{"name":"libpff","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libpff?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20120802-5","20120802-5.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpff1","binary_version":"20120802-5.1"},{"binary_name":"pff-tools","binary_version":"20120802-5.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110598.json"}},{"package":{"name":"libpff","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libpff?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20180714-1","20180714-2"],"ecosystem_specific":{"binaries":[{"binary_version":"20180714-2","binary_name":"libpff1"},{"binary_version":"20180714-2","binary_name":"pff-tools"},{"binary_name":"python3-pypff","binary_version":"20180714-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110598.json"}},{"package":{"name":"libpff","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libpff?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20180714-3","20180714-3build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpff1","binary_version":"20180714-3build1"},{"binary_version":"20180714-3build1","binary_name":"pff-tools"},{"binary_name":"python3-pypff","binary_version":"20180714-3build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110598.json"}},{"package":{"name":"libpff","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libpff?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20180714-3build2","20180714-3build3","20180714-3.1","20180714-3.1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpff1t64","binary_version":"20180714-3.1build1"},{"binary_name":"pff-tools","binary_version":"20180714-3.1build1"},{"binary_name":"python3-pypff","binary_version":"20180714-3.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110598.json"}},{"package":{"name":"libpff","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libpff?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20231205-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpff1t64","binary_version":"20231205-1build1"},{"binary_name":"pff-tools","binary_version":"20231205-1build1"},{"binary_version":"20231205-1build1","binary_name":"python3-pypff"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110598.json"}},{"package":{"name":"libpff","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libpff?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20180714-3.1build2","20231205-1","20231205-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"20231205-1build1","binary_name":"libpff1t64"},{"binary_name":"pff-tools","binary_version":"20231205-1build1"},{"binary_version":"20231205-1build1","binary_name":"python3-pypff"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110598.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}