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CVE-2026-42483

A heap-based buffer overflow in the Kerberos hash parser in hashcat v7.1.2 allows an attacker to...

9.8 Critical

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.30%Up 0.2 points since May 2, 2026
90%50%10%1%

What each source reports

NVD Score used 9.8

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.

Record
CVE-2026-42483
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-787, CWE-122
Updated
2026-11-02
CVE List 7.3

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.

Record
CVE-2026-42483
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-122
Updated
2026-11-02
EUVDEUVD-2026-26530 7.3

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.

Record
EUVD-2026-26530
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-h95h-gpf2-gm79 9.8

A heap-based buffer overflow in the Kerberos hash parser in hashcat v7.1.2 allows an attacker to...

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.

Record
GHSA-h95h-gpf2-gm79
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-122, CWE-787
Updated
2026-11-02
OSV 7.3

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.

Record
CVE-2026-42483
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2026-42483 9.8

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.

Record
DEBIAN-CVE-2026-42483
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-42483 9.8

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.

Record
UBUNTU-CVE-2026-42483
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
hashcat
Debian:12
All versions, plus listed versions
6.2.6+ds1-16.2.6+ds2-17.1.2+ds1-17.1.2+ds1-27.1.2+ds1-37.1.2+ds1-4
None known
hashcat
Debian:13
All versions, plus listed versions
6.2.6+ds2-17.1.2+ds1-17.1.2+ds1-27.1.2+ds1-37.1.2+ds1-4
None known
hashcat
Debian:14
All versions, plus listed versions
6.2.6+ds2-17.1.2+ds1-17.1.2+ds1-27.1.2+ds1-37.1.2+ds1-4
None known
hashcat
Ubuntu:18.04:LTS
All versions, plus listed versions
3.60-14.0.1-1
None known
hashcat
Ubuntu:20.04:LTS
All versions, plus listed versions
5.1.0+ds1-15.1.0+ds1-2
None known
hashcat
Ubuntu:22.04:LTS
All versions, plus listed versions
6.1.1+ds1-16.2.5+ds1-2
None known
hashcat
Ubuntu:24.04:LTS
All versions, plus listed versions
6.2.6+ds1-16.2.6+ds1-1build16.2.6+ds1-1build2
None known
hashcat
Ubuntu:25.10
All versions, plus listed versions
6.2.6+ds2-1
None known
hashcat
Ubuntu:26.10
All versions, plus listed versions
7.1.2+ds1-37.1.2+ds1-4
None known
hashcat
Ubuntu:26.04:LTS
All versions, plus listed versions
6.2.6+ds2-17.1.2+ds1-3
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42483 is a critical vulnerability (CVSS 9.8) in Hashcat, published May 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 23rd percentile. No source names a fixed version.

References

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