{"cve":{"cve_id":"CVE-2026-18374","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":0.0015,"epss_percentile":0.04492,"epss_as_of":"2026-09-15","description":"Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled.\n\n\n\nThis usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.","published_at":"2026-08-27T19:20:40.426000Z","last_modified_at":"2026-09-03T16:43:15.293000Z","cvss_v3_score":4.9,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-787"],"nvd_references":["https://sourceware.org/bugzilla/show_bug.cgi?id=34574","https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0015"],"vuln_status":"Awaiting Analysis","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":"2026-08-27T20:39:11.367619Z","updated_at":"2026-09-05T03:34:00.378165Z"},"effective_severity":"MEDIUM","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":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"the-gnu-c-library","vendor_name":"The GNU C Library","product_slug":"glibc","product_name":"glibc","version_start":"0","version_start_inclusive":true,"version_end":"2.45","version_end_inclusive":false,"cpe23_uri":"cve5:the-gnu-c-library:glibc:0:2.45"}],"exploit_refs":[],"news":[],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34574","source_type":"MISC","tags":[]},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0015","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-08-27T19:20:40.426000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-08-28T17:05:04.742650Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-28T17:05:04.742650Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-28T17:05:04.742650Z","label":"SSVC decision revised","source":"vulnrichment"}]}