{"cve":{"cve_id":"CVE-2025-68431","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00267,"epss_percentile":0.1812,"epss_as_of":"2026-06-23","description":"libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes.","published_at":"2025-12-29T19:09:54.628000Z","last_modified_at":null,"cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-125","CWE-190"],"nvd_references":["https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq","https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46","https://github.com/strukturag/libheif/releases/tag/v1.21.0"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:28:20.782852Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"strukturag","vendor_name":"strukturag","product_slug":"libheif","product_name":"libheif","version_start":"< 1.21.0","version_start_inclusive":true,"version_end":"< 1.21.0","version_end_inclusive":true,"cpe23_uri":"cve5:strukturag:libheif:< 1.21.0:< 1.21.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/strukturag/libheif/releases/tag/v1.21.0","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2025-12-29T19:09:54.628000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:49:19.898422Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:19.898422Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:19.898422Z","label":"CVSS score revised","source":"cvelistv5"}]}