{"cve":{"cve_id":"CVE-2026-77118","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":0.00131,"epss_percentile":0.02918,"epss_as_of":"2026-08-26","description":"A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pcd.c), the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated luma/chroma plane buffers. The pointer is repositioned only when a sync marker introduces a new plane/row; between sync markers the run length is bounded solely by the input.\n\n\n\nA crafted PCD file that positions the pointer near the end of a plane and then supplies a long run of deltas with no intervening sync therefore walks the pointer past the end of the allocation and writes through it. Processing an untrusted PCD file — for example with gm convert or gm identify, or through any application linked against libGraphicsMagick — can corrupt heap memory beyond the buffers.","published_at":"2026-08-20T12:42:42.952000Z","last_modified_at":"2026-08-26T20:18:01.660000Z","cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":8.4,"cvss_v4_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","cvss_v4_severity":"HIGH","ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-787"],"nvd_references":["https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/commit/937cdd9920bd96","https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/raw/GraphicsMagick-1_3_48/ChangeLog"],"vuln_status":"Received","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":"2026-08-20T13:42:27.512824Z","updated_at":"2026-08-27T18:05:39.505320Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"A","value_label":"Active"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"debian","vendor_name":"debian","product_slug":"debian-linux","product_name":"debian_linux","version_start":"11","version_start_inclusive":true,"version_end":"11","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*"},{"vendor_slug":"debian","vendor_name":"debian","product_slug":"debian-linux","product_name":"debian_linux","version_start":"12","version_start_inclusive":true,"version_end":"12","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:debian:debian_linux:12:*:*:*:*:*:*:*"},{"vendor_slug":"debian","vendor_name":"debian","product_slug":"debian-linux","product_name":"debian_linux","version_start":"13","version_start_inclusive":true,"version_end":"13","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:debian:debian_linux:13:*:*:*:*:*:*:*"},{"vendor_slug":"fedoraproject","vendor_name":"fedoraproject","product_slug":"extra-packages-for-enterprise-linux","product_name":"extra_packages_for_enterprise_linux","version_start":"8.0","version_start_inclusive":true,"version_end":"8.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*"},{"vendor_slug":"fedoraproject","vendor_name":"fedoraproject","product_slug":"extra-packages-for-enterprise-linux","product_name":"extra_packages_for_enterprise_linux","version_start":"9.0","version_start_inclusive":true,"version_end":"9.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0:*:*:*:*:*:*:*"},{"vendor_slug":"graphicsmagick","vendor_name":"graphicsmagick","product_slug":"graphicsmagick","product_name":"graphicsmagick","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:a:graphicsmagick:graphicsmagick:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/commit/937cdd9920bd96","source_type":"MISC","tags":["patch"]},{"url":"https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/raw/GraphicsMagick-1_3_48/ChangeLog","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-08-20T12:42:42.952000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-08-27T00:40:11.368042Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-27T00:40:11.368042Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-27T00:40:11.368042Z","label":"SSVC decision revised","source":"vulnrichment"}]}