Critical
hashcat — security advisory
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.
- Products
- hashcat
- Affected versions
- 3.60-1, 4.0.1-1, 5.1.0+ds1-1, 5.1.0+ds1-2, 6.1.1+ds1-1, 6.2.5+ds1-2, 6.2.6+ds1-1, 6.2.6+ds1-1build1, 6.2.6+ds1-1build2, 6.2.6+ds2-1, 7.1.2+ds1-3, 7.1.2+ds1-4
- Fixed versions
- Not specified
- CVEs
- CVE-2026-42483
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:03 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-42483
hashcat
Fixed versions: Not specified
hashcat
Fixed versions: Not specified
hashcat
Fixed versions: Not specified
hashcat
Fixed versions: Not specified
hashcat
Fixed versions: Not specified
hashcat
Fixed versions: Not specified
hashcat
Fixed versions: Not specified
Complete source record
{
"id": "4e16bb07ef638e5a151a5090133a19214498f39d5979eb06a95b80f0cd27cb08",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-42483",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-42483",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-42483",
"products": [
{
"name": {
"value": "hashcat",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.60-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.1-1",
"evidence": "/affected/0/versions"
}
]
},
{
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"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/1/versions"
},
{
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{
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"evidence": "/affected/3/versions"
},
{
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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},
{
"name": {
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"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/6/versions"
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{
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],
"severity": "critical",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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"events": [
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}
],
"package": {
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"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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"4.0.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42483.json"
},
"ecosystem_specific": {
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"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
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"5.1.0+ds1-2"
],
"database_specific": {
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},
"ecosystem_specific": {
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},
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}
]
}
},
{
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{
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}
],
"package": {
"name": "hashcat",
"purl": "pkg:deb/ubuntu/hashcat?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"6.1.1+ds1-1",
"6.2.5+ds1-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42483.json"
},
"ecosystem_specific": {
"binaries": [
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},
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{
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"versions": [
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"6.2.6+ds1-1build1",
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},
"ecosystem_specific": {
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},
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},
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
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],
"database_specific": {
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},
"ecosystem_specific": {
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},
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},
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],
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},
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}
],
"modified": "2026-10-17T13:00:05.133972476Z",
"provider": "osv",
"upstream": [
"CVE-2026-42483"
],
"references": [
"https://ubuntu.com/security/CVE-2026-42483",
"https://www.cve.org/CVERecord?id=CVE-2026-42483",
"https://gist.github.com/sgInnora/107f2eb20367e47d58c911e38d56a91f"
]
},
"related_cves": [
{
"value": "CVE-2026-42483",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360285,
"published_at": "2026-05-01T14:16:00+00:00"
}