CVE-2026-42482Public exploit

Process crash via undersized hex expansion check

Published May 1, 2026 · Updated May 1, 2026

Stack-based buffer overflow in hashcat 7.1.2 allows context-dependent attackers to crash the process via crafted rule input. The mangle_to_hex_lower() and mangle_to_hex_upper() functions accept 128-to-255-byte candidates because the 256-byte bound ignores twofold hexadecimal expansion, then write beyond rule_buf_out. A victim must process an attacker-controlled rule or long password candidate; a reliable crash is demonstrated, while hex-only overwrite bytes and stack canaries constrain code execution.

CVSS severity9.8
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in hashcat 7.1.2 allows context-dependent attackers to crash the process via crafted rule input. The mangle_to_hex_lower() and mangle_to_hex_upper() functions accept 128-to-255-byte candidates because the 256-byte bound ignores twofold hexadecimal expansion, then write beyond rule_buf_out. A victim must process an attacker-controlled rule or long password candidate; a reliable crash is demonstrated, while hex-only overwrite bytes and stack canaries constrain code execution.

The record

CVE
CVE-2026-42482
Published
May 1, 2026
Updated
May 1, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, CWE-787, T1204.002
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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