{"id":"CVE-2026-68768","title":"hashcat contains a heap-based buffer overflow (out-of-bounds write) in the outfile_write() function in src/outfile.c","summary":"hashcat contains a heap-based buffer overflow (out-of-bounds write) in the outfile_write() function in src/outfile.c. When assembling output into a fixed-size buffer (HCBUFSIZ_LARGE, ~16 MB), the function sequentially appends the usernam…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","cwe":["CWE-120"],"published":"2026-08-22","updated":"2026-08-22","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-68768","references":[{"url":"https://github.com/hashcat/hashcat","label":"disclosure@vulncheck.com"},{"url":"https://github.com/hashcat/hashcat/blob/v7.1.2/src/outfile.c#L654-L668","label":"disclosure@vulncheck.com"},{"url":"https://github.com/hashcat/hashcat/commit/68f56a2d8712867a8520bf4dcf07f6145c23df89","label":"disclosure@vulncheck.com"},{"url":"https://github.com/hashcat/hashcat/issues/4740","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/hashcat-through-heap-buffer-overflow-in-outfile-write-via-oversized-username","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"ingestedAt":"2026-08-23T04:42:15.544Z","epss":0.00141,"epssPercentile":0.03822,"slug":"CVE-2026-68768","body":"## Overview\n\nhashcat contains a heap-based buffer overflow (out-of-bounds write) in the outfile_write() function in src/outfile.c. When assembling output into a fixed-size buffer (HCBUFSIZ_LARGE, ~16 MB), the function sequentially appends the username, separator, hash, and plaintext via memcpy without validating that the accumulated length stays within the buffer capacity. When run with --username --show against a crafted hash file containing an oversized username that nearly fills the buffer, the total assembled output exceeds the buffer, causing a heap buffer overflow that can corrupt memory and crash the process.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}