{"schemaVersion":3,"id":"CVE-2026-3950","aliases":["UBUNTU-CVE-2026-3950","DEBIAN-CVE-2026-3950"],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability was identified in strukturag libheif up to 1.21.2. This impacts the function Track::load of the file libheif/sequences/track.cc of the component stsz/stts. The manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. Applying a patch is the recommended action to fix this issue. The patch available is inofficial and not approved yet.","dates":{"published":"2026-03-11T19:02:08.446Z","modified":"2026-03-11T20:24:59.822Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.8,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":4.8,"severity":"medium","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":3.3,"severity":"low","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":3.3,"severity":"low","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"CVE.org","score":1.7,"severity":"low","vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":4.8,"severity":"medium","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":3.3,"severity":"low","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","exploitability":4.6,"impact":2.3,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":4.8,"severity":"medium","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":1.9,"severity":"low","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":3.3,"severity":"low","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":1.7,"severity":"low","vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00187,"percentile":0.07792,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.06999999999999999,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00117},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00166,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00166,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00187,"percentile":0.07792}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00117,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0016,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00166,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00166,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00187,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00187,"percentile":0.07792}]},"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":[{"id":"GITHUB_NIEBELUNGEN-D_POCS","name":"Pocs","source":"github","url":"https://github.com/Niebelungen-D/pocs/tree/main/heif_dec_sequence_chunk_idx_oob","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer","description":"The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/119.html"},{"id":"CWE-125","name":"Out-of-bounds Read","description":"The product reads data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/125.html"}],"affected":[{"vendor":"debian","product":"libheif","name":"libheif","label":"libheif","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libheif","purlType":"deb","versions":[{"text":"< 1.23.1-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.23.1-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libheif","name":"libheif","label":"libheif","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libheif","purlType":"deb","versions":[{"text":"< 1.20.2-1ubuntu0.4","noFixRecorded":false,"fixedIn":null},{"text":"< 1.21.2-3ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.20.2-1ubuntu0.4 | < 1.21.2-3ubuntu0.1","eol":null,"hubHref":null},{"vendor":"strukturag","product":"libheif","name":"libheif","label":"libheif","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"1.21.0","noFixRecorded":false,"fixedIn":null},{"text":"1.21.1","noFixRecorded":false,"fixedIn":null},{"text":"1.21.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"1.21.0 | 1.21.1 | 1.21.2","eol":null,"hubHref":"/vendor/strukturag/libheif"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://vuldb.com/?id.350382","label":"vuldb.com?id.350382","hostname":"vuldb.com","tags":["VDB Entry","Technical Description"]},{"url":"https://vuldb.com/?ctiid.350382","label":"vuldb.com?ctiid.350382","hostname":"vuldb.com","tags":["Signature","Permissions Required"]},{"url":"https://vuldb.com/?submit.766431","label":"vuldb.com?submit.766431","hostname":"vuldb.com","tags":["Third Party Advisory"]},{"url":"https://github.com/strukturag/libheif/issues/1715","label":"github.com/strukturag/libheif/issues/1715","hostname":"github.com","tags":["Issue Tracking"]},{"url":"https://github.com/Niebelungen-D/pocs/tree/main/heif_dec_sequence_chunk_idx_oob","label":"github.com/Niebelungen-D/pocs/tree/main/heif_dec_sequence_chunk_idx_oob","hostname":"github.com","tags":["Exploit"]},{"url":"https://github.com/strukturag/libheif/pull/1721","label":"github.com/strukturag/libheif/pull/1721","hostname":"github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/strukturag/libheif/","label":"github.com/strukturag/libheif/","hostname":"github.com","tags":["Product"]},{"url":"https://ubuntu.com/security/CVE-2026-3950","label":"ubuntu.com/security/CVE-2026-3950","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3950","label":"www.cve.org/CVERecord?id=CVE-2026-3950","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8454-1","label":"ubuntu.com/security/notices/USN-8454-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-3950","label":"security-tracker.debian.org/tracker/CVE-2026-3950","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2026-0247","OPENSUSE-SU-2026:10878-1","OPENSUSE-SU-2026:20974-1","SUSE-SU-2026:22153-1","SUSE-SU-2026:2622-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:10878-1","OPENSUSE-SU-2026:20974-1","SUSE-SU-2026:22153-1","SUSE-SU-2026:2622-1","USN-8454-1"]},"timeline":[{"kind":"published","date":"2026-03-11T19:02:08.446Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-03-11T20:24:59.822Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":29,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T07:11:32.035Z","stale":false,"partial":false}}