UBUNTU-CVE-2026-56288 (CVE-2026-56288)
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 NULL pointer dereference when processing a specially crafted unified-diff patch file. Improper handling of consecutive end-of-file newline markers can corrupt internal hunk (single block of changes in diff) data structures, causing the application to pass a NULL pointer to fwrite() during patch processing. An attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service. This issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313
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 crash 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 crash 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 crash 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 crash 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 crash 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 crash 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 crash 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 crash 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 NULL pointer dereference when processing a specially crafted unified-diff patch file. Improper handling of consecutive end-of-file newline markers can corrupt internal hunk (single block of changes in diff) data structures, causing the application to pass a NULL pointer to fwrite() during patch processing. An attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service. This issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313",
"id": "UBUNTU-CVE-2026-56288",
"modified": "2026-08-26T04:36:29Z",
"published": "2026-07-09T11:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-56288"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-56288"
},
{
"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:N",
"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-2026-56288"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- 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
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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