Bug 2521351 (CVE-2026-68767)

Summary: CVE-2026-68767 hashcat: hashcat: Out-of-bounds heap write leading to denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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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.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2521893    
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Description OSIDB Bzimport 2026-08-22 14:32:43 UTC 
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.