UBUNTU-CVE-2026-56289 (CVE-2026-56289)
Vulnerability from osv_ubuntu – Published: 2026-07-09 11:16 – Updated: 2026-08-26 04:36 – Source website
VLAI
Details
GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position. This results in excessive CPU consumption and prevents the process from completing. An attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination. This issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9
Severity
5.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.7.1-4ubuntu2.4+esm1"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.7.1-4ubuntu2.4+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.1-3",
"2.7.1-4",
"2.7.1-4ubuntu1",
"2.7.1-4ubuntu2",
"2.7.1-4ubuntu2.3",
"2.7.1-4ubuntu2.4",
"2.7.1-4ubuntu2.4+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.7.5-1ubuntu0.16.04.2"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.7.5-1ubuntu0.16.04.2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.5-1",
"2.7.5-1ubuntu0.16.04.1",
"2.7.5-1ubuntu0.16.04.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.7.6-2ubuntu1.1"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.7.6-2ubuntu1.1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.5-1build1",
"2.7.6-1",
"2.7.6-2ubuntu1",
"2.7.6-2ubuntu1.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.7.6-6"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.7.6-6?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.6-6"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.7.6-7build2"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.7.6-7build2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.6-7",
"2.7.6-7build1",
"2.7.6-7build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.7.6-7build3"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.7.6-7build3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.6-7build2",
"2.7.6-7build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.8-2"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.8-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.6-7build3",
"2.8-1",
"2.8-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "patch",
"binary_version": "2.8-2build1"
}
],
"priority_reason": "Only a DoS in a command line tool"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "patch",
"purl": "pkg:deb/ubuntu/patch@2.8-2build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.8-2",
"2.8-2build1"
]
}
],
"aliases": [],
"details": "GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position. This results in excessive CPU consumption and prevents the process from completing. An attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination. This issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9",
"id": "UBUNTU-CVE-2026-56289",
"modified": "2026-08-26T04:36:29Z",
"published": "2026-07-09T11:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-56289"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-56289"
},
{
"type": "REPORT",
"url": "https://cert.pl/en/posts/2026/07/CVE-2026-56288"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-56289"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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