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CVE-2026-68768— hashcat through 7.1.2 Heap Buffer Overflow in outfile_write() via Oversized Username

Quick assessment

Affected
hashcat hashcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

hashcat是hashcat团队的一款密码恢复工具。 hashcat 7.1.2及之前版本存在缓冲区错误漏洞，该漏洞源于src/outfile.c文件中的outfile_write()函数存在堆缓冲区溢出（越界写入），在将用户名、分隔符、哈希和明文通过memcpy依次追加到固定大小缓冲区时未验证累积长度，可能导致内存损坏和进程崩溃。

CVSS 6.1 · Medium EPSS 0.21% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
hashcat hashcat ≤ 7.1.2 affected
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I. Basic Information for CVE-2026-68768

Vulnerability Information
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Vulnerability Title
hashcat through 7.1.2 Heap Buffer Overflow in outfile_write() via Oversized Username
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
hashcat 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
hashcat是hashcat团队的一款密码恢复工具。 hashcat 7.1.2及之前版本存在缓冲区错误漏洞，该漏洞源于src/outfile.c文件中的outfile_write()函数存在堆缓冲区溢出（越界写入），在将用户名、分隔符、哈希和明文通过memcpy依次追加到固定大小缓冲区时未验证累积长度，可能导致内存损坏和进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hashcat hashcat 0 ~ 7.1.2 -

II. Public POCs for CVE-2026-68768

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III. Intelligence Information for CVE-2026-68768

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Patches & Fixes for CVE-2026-68768 (1)

Vendor Advisories for CVE-2026-68768 (2)

Proof of Concept for CVE-2026-68768 (1)

Same Patch Batch · hashcat · 2026-08-22 · 3 CVEs total

CVE-2026-68766 7.8 HIGH hashcat through 7.1.2 Arbitrary File Write via Restore File Option Injection
CVE-2026-68767 6.1 MEDIUM hashcat through 7.1.2 Off-by-One Out-of-Bounds Heap Write in fgetl()

IV. Related Vulnerabilities

Same product: hashcat
Same vendor: hashcat
Same weakness: CWE-120

V. Comments for CVE-2026-68768

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