{"cve":{"cve_id":"CVE-2026-41991","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":0.00117,"epss_percentile":0.01844,"epss_as_of":"2026-08-26","description":"GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks.\nA local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite.\n\nThis issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269","published_at":"2026-06-29T10:15:50.766000Z","last_modified_at":"2026-07-01T14:02:24.450000Z","cvss_v3_score":4.7,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":2.0,"cvss_v4_vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","cvss_v4_severity":"LOW","ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-377"],"nvd_references":["https://cert.pl/en/posts/2026/04/CVE-2026-41991/","https://www.gnu.org/software/gzip/","https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=4e6f8b24ab823146ab8776f0b7fe486ab34d4269"],"vuln_status":"Analyzed","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":"2026-06-29T23:46:59.033383Z","updated_at":"2026-07-02T07:33:52.206779Z"},"effective_severity":"LOW","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"AT","name":"Attack Requirements","value":"P","value_label":"Present"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"P","value_label":"Passive"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"L","value_label":"Low"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"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":"gnu","vendor_name":"gnu","product_slug":"gzip","product_name":"gzip","version_start":"0","version_start_inclusive":true,"version_end":"1.14","version_end_inclusive":true,"cpe23_uri":"cve5:gnu:gzip:0:1.14"},{"vendor_slug":"gnu","vendor_name":"gnu","product_slug":"gzip","product_name":"gzip","version_start":null,"version_start_inclusive":null,"version_end":"1.14","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:gnu:gzip:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://cert.pl/en/posts/2026/04/CVE-2026-41991/","source_type":"MISC","tags":[]},{"url":"https://www.gnu.org/software/gzip/","source_type":"MISC","tags":[]},{"url":"https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=4e6f8b24ab823146ab8776f0b7fe486ab34d4269","source_type":"MISC","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-06-29T10:15:50.766000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-07-02T07:33:52.206779Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-07-02T07:33:52.206779Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-07-02T07:33:52.206779Z","label":"CVSS score revised","source":"nvd"}]}