CVE-2026-68768

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 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.

• CWE-120

• https://github.com/hashcat/hashcat
• https://github.com/hashcat/hashcat/blob/v7.1.2/src/outfile.c#L654-L668
• https://github.com/hashcat/hashcat/commit/68f56a2d8712867a8520bf4dcf07f6145c23df89
• https://github.com/hashcat/hashcat/issues/4740
• https://www.vulncheck.com/advisories/hashcat-through-heap-buffer-overflow-in-outfile-write-via-oversized-username
• https://github.com/hashcat/hashcat/issues/4740

Published

Aug 22, 2026

Last Modified

Aug 24, 2026

Status

Received

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