Description
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.
Published: 2026-08-22
Score: 6.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Advisories

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History

Sat, 22 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Description 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.
Title hashcat through 7.1.2 Heap Buffer Overflow in outfile_write() via Oversized Username
First Time appeared Hashcat
Hashcat hashcat
Weaknesses CWE-120
CPEs cpe:2.3:a:hashcat:hashcat:*:*:*:*:*:*:*:*
Vendors & Products Hashcat
Hashcat hashcat
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Hashcat Hashcat
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-22T14:12:44.241Z

Reserved: 2026-07-31T16:10:55.447Z

Link: CVE-2026-68768

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-22T15:16:20.903

Modified: 2026-08-22T15:16:20.903

Link: CVE-2026-68768

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-22T15:30:05Z

Weaknesses