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CVE-2026-68767— hashcat through 7.1.2 Off-by-One Out-of-Bounds Heap Write in fgetl()

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及之前版本存在数字错误漏洞，该漏洞源于src/filehandling.c中的fgetl()函数在输入行恰好为缓冲区长度时，在调用方缓冲区之外写入一个字节的空终止符，导致越界堆写入，攻击者可通过提供包含恰好为HCBUFSIZ_LARGE字节行的哈希文件、potfile或wordlist触发该漏洞。

CVSS 6.1 · Medium EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
hashcat hashcat ≤ 7.1.2 affected
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I. Basic Information for CVE-2026-68767

Vulnerability Information
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Vulnerability Title
hashcat through 7.1.2 Off-by-One Out-of-Bounds Heap Write in fgetl()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
hashcat 数字错误漏洞
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及之前版本存在数字错误漏洞，该漏洞源于src/filehandling.c中的fgetl()函数在输入行恰好为缓冲区长度时，在调用方缓冲区之外写入一个字节的空终止符，导致越界堆写入，攻击者可通过提供包含恰好为HCBUFSIZ_LARGE字节行的哈希文件、potfile或wordlist触发该漏洞。
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-2026-68767

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III. Intelligence Information for CVE-2026-68767

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Patches & Fixes for CVE-2026-68767 (1)

Vendor Advisories for CVE-2026-68767 (1)

Proof of Concept for CVE-2026-68767 (2)

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-2026-68768 6.1 MEDIUM hashcat through 7.1.2 Heap Buffer Overflow in outfile_write() via Oversized Username

IV. Related Vulnerabilities

Same product: hashcat
Same vendor: hashcat
Same weakness: CWE-193

V. Comments for CVE-2026-68767

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