CVE-2026-68765

Heap corruption via oversized token decode

Published Aug 17, 2026 · Updated Aug 18, 2026

Heap buffer overflow in hashcat after 7.1.2 allows local users to corrupt heap memory via a crafted KeePass KDBX v4 hash file. In src/modules/module_34301.c, module_hash_decode accepts token 9 at up to 600 hex characters, derives a byte length from that untrusted value, and hex-decodes it into keepass4->header, a fixed 256-byte buffer, without first rejecting oversized results. Exposure requires local execution of hashcat on attacker-supplied hash material, and the published impact is bounded to heap corruption or memory access violations rather than confirmed code execution.

CVSS severity5.2
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in hashcat after 7.1.2 allows local users to corrupt heap memory via a crafted KeePass KDBX v4 hash file. In src/modules/module_34301.c, module_hash_decode accepts token 9 at up to 600 hex characters, derives a byte length from that untrusted value, and hex-decodes it into keepass4->header, a fixed 256-byte buffer, without first rejecting oversized results. Exposure requires local execution of hashcat on attacker-supplied hash material, and the published impact is bounded to heap corruption or memory access violations rather than confirmed code execution.

The record

CVE
CVE-2026-68765
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
hashcat
Product
hashcat
Classifications
CWE-122
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=ef52453 <6f374c4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

hashcat · hashcatversion=ef52453 <6f374c4

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
5.2VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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