CVE-2026-68768
MEDIUM
6,9
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: none
User Interaction: passive
Confidentiality: N/A
Integrity: N/A
Availability: N/A
MEDIUM
6,1
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: none
User Interaction: required
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: high
Description
AI Translation Available
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.
120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
IncompleteCommon Consequences
Security Scopes Affected:
Integrity
Confidentiality
Availability
Potential Impacts:
Modify Memory
Execute Unauthorized Code Or Commands
Dos: Crash, Exit, Or Restart
Dos: Resource Consumption (Cpu)
Applicable Platforms
Languages:
Memory-Unsafe, C, C++, Assembly
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/68f56a2d8712867a8520bf4dcf07f6145c23d…
https://github.com/hashcat/hashcat/issues/4740
https://www.vulncheck.com/advisories/hashcat-through-heap-buffer-overflow-in-ou…