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Vulnerability record · CVE-2026-42483 · published 1 May 2026

CVE-2026-42483: Hashcat out-of-bounds write vulnerability

Hashcat · Hashcat

A heap-based buffer overflow in the Kerberos hash parser in hashcat v7.1.2 allows an attacker to cause a denial of service or possibly execute arbitrary code via a crafted Kerberos hash file. The issue affects module_hash_decode in multiple Kerberos-related modules because account_info_len is calculated from untrusted delimiter positions without upper-bound validation before memcpy copies the data into a fixed-size account_info buffer.

9.8 CVSS 3.1 Critical EPSS 0.49% · top 60.3% CWE-787 · Out-of-bounds writeCWE-122 · Heap-based buffer overflow
9.8CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A heap-based buffer overflow in the Kerberos hash parser in hashcat v7.1.2 allows an attacker to cause a denial of service or possibly execute arbitrary code via a crafted Kerberos hash file. The issue affects module_hash_decode in multiple Kerberos-related modules because account_info_len is calculated from untrusted delimiter positions without upper-bound validation before memcpy copies the data into a fixed-size account_info buffer.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gist.github.com/sgInnora/107f2eb20367e47d58c911e38d56a91f ExploitMitigationThird Party Advisory
https://gist.github.com/sgInnora/107f2eb20367e47d58c911e38d56a91f ExploitMitigationThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-42483), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.