{"id":"CVE-2026-5450","title":"scanf %mc off-by-one heap buffer overflow","summary":"Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer ov…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"adp","cwe":["CWE-122"],"vendor":"The GNU C Library","product":"glibc","affected":["glibc >= 2.7 < *"],"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-04-21T16:11:50.875542Z"},"exploitAvailable":true,"published":"2026-04-20","updated":"2026-10-15","sourceUpdated":"2026-10-15T01:12:13.391Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-5450","references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450"},{"url":"https://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#u"}],"tags":["cve.org","exploit-available"],"epss":0.00718,"epssPercentile":0.5281,"ingestedAt":"2026-10-15T05:52:46.047Z","slug":"CVE-2026-5450","body":"## Overview\n\nCalling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.\n\n## Affected\n\n- `glibc >= 2.7 < *`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}