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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 的 函数位于 文件中，当输入行的长度恰好等于缓冲区长度时，该函数会在调用者提供的缓冲区末尾之后一个字节的位置写入空终止符（null terminator）。攻击者可以通过提供一个哈希文件、pot 文件或词表，其中包含一条长度恰好为 HCBUFSIZ_LARGE 字节的行，从而触发此越界堆写入漏洞。

CVSS 6.1 · Medium EPSS 0.17% · P7

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

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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