CVE-2026-68767
Description
A flaw was found in hashcat. The fgetl() function in src/filehandling.c incorrectly writes a null terminator one byte beyond the allocated buffer when processing an input line that exactly matches the buffer's length. A local attacker can exploit this out-of-bounds heap write by providing a specially crafted hash file, potfile, or wordlist. This can lead to a denial of service.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
To mitigate this issue, users of hashcat should avoid processing untrusted hash files, potfiles, or wordlists. Only process input files from known, trusted sources to prevent triggering the out-of-bounds write vulnerability.
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Instability
This weakness will generally lead to undefined behavior and therefore crashes. In the case of overflows involving loop index variables, the likelihood of infinite loops is also high.
Integrity
Technical Impact: Modify Memory
If the value in question is important to data (as opposed to flow), simple data corruption has occurred. Also, if the wrap around results in other conditions such as buffer overflows, further memory corruption may occur.
Confidentiality,Availability,Access Control
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism
This weakness can sometimes trigger buffer overflows which can be used to execute arbitrary code. This is usually outside the scope of a program's implicit security policy.
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