CVE-2026-68768
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
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 username, separator, hash, and plaintext via memcpy without validating that the accumulated length stays within the buffer capacity.
Risk Assessment
An attacker can cause memory corruption and process crash, potentially leading to denial of service or possibly arbitrary code execution.
Recommendation
Update hashcat to the latest version that includes a security fix for the outfile_write() function.
Other vulnerabilities in hashcat
See all- CVE-2026-42483Critical
In version 7.1.2 of hashcat, there is a heap-based buffer overflow in the Kerberos hash parser, allowing an attacker to cause a denial of service or potentially execute arbitrary code via a crafted Kerberos hash file.
- CVE-2026-42482Critical
A stack-based buffer overflow in mangle_to_hex_lower() and mangle_to_hex_upper() in hashcat v7.1.2 allows for denial of service or arbitrary code execution via a crafted rule file or the -j or -k options with password candidates of 128 or more characters.
- CVE-2026-68767Medium
hashcat's fgetl() function in src/filehandling.c writes a null terminator one byte past the caller's buffer when an input line is exactly the buffer length. Attackers can trigger this out-of-bounds heap write by providing a hash file, potfile, or wordlist containing a line of exactly HCBUFSIZ_LARGE bytes.
- CVE-2026-68766High
Hashcat fails to restrict command-line options when parsing restore files, allowing attackers to inject output-redirecting options like --outfile and --potfile-path. Attackers can craft restore files with malicious options to append attacker-controlled content to arbitrary files, enabling code execution when targeting shell startup files.
- CVE-2026-68765Medium
hashcat master branch builds after v7.1.2 contain a heap buffer overflow vulnerability in the KeePass AESKDF/KDBX v4 module (module 34301). An oversized ninth hash field token can corrupt adjacent heap memory, potentially leading to heap corruption or memory access violations.
Original NVD description (English source)
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.