ubuntu-cve-2026-42250
Vulnerability from osv_ubuntu
Published
2026-05-28 14:16
Modified
2026-09-01 06:05
Summary
Details
bzip2 contains an off‑by‑one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out‑of‑bounds write to a global buffer, resulting in memory corruption and a crash (denial of service). This issue was fixed in bzip2 patch 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.6-5ubuntu0.1~esm3"
},
{
"binary_name": "lib32bz2-1.0",
"binary_version": "1.0.6-5ubuntu0.1~esm3"
},
{
"binary_name": "lib64bz2-1.0",
"binary_version": "1.0.6-5ubuntu0.1~esm3"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.6-5ubuntu0.1~esm3"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.6-5ubuntu0.1~esm3?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.6-5ubuntu0.1~esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.6-4",
"1.0.6-5",
"1.0.6-5ubuntu0.1~esm1",
"1.0.6-5ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.6-8ubuntu0.2+esm1"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.6-8ubuntu0.2+esm1"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.6-8ubuntu0.2+esm1?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.6-8ubuntu0.2+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.6-8",
"1.0.6-8ubuntu0.1",
"1.0.6-8ubuntu0.2"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.6-8.1ubuntu0.2+esm1"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.6-8.1ubuntu0.2+esm1"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.6-8.1ubuntu0.2+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.6-8.1ubuntu0.2+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.6-8.1",
"1.0.6-8.1ubuntu0.1",
"1.0.6-8.1ubuntu0.2"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.8-2ubuntu0.1~esm1"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.8-2ubuntu0.1~esm1"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.8-2ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.8-2ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.6-9.2",
"1.0.8-2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.8-5ubuntu0.1"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.8-5ubuntu0.1"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.8-5ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.8-5ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.8-4ubuntu3",
"1.0.8-4ubuntu4",
"1.0.8-5",
"1.0.8-5build1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.8-5.1ubuntu0.1"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.8-5.1ubuntu0.1"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.8-5.1ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.8-5.1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.8-5build1",
"1.0.8-5ubuntu1",
"1.0.8-5.1",
"1.0.8-5.1build0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.8-6build1"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.8-6build1"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.8-6build1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.8-6",
"1.0.8-6build1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bzip2",
"binary_version": "1.0.8-6ubuntu0.1"
},
{
"binary_name": "libbz2-1.0",
"binary_version": "1.0.8-6ubuntu0.1"
}
],
"priority_reason": "Only a denial of service in a command line utility"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "bzip2",
"purl": "pkg:deb/ubuntu/bzip2@1.0.8-6ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.8-6ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.8-6build1",
"1.0.8-6build2"
]
}
],
"aliases": [],
"details": "bzip2 contains an off\u2011by\u2011one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out\u2011of\u2011bounds write to a global buffer, resulting in memory corruption and a crash (denial of service). This issue was fixed in bzip2 patch\u00a035d122a3df8b0cc4082a4d89fdc6ee99f375fe67",
"id": "UBUNTU-CVE-2026-42250",
"modified": "2026-09-01T06:05:39Z",
"published": "2026-05-28T14:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42250"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42250"
},
{
"type": "REPORT",
"url": "https://cert.pl/en/posts/2026/05/CVE-2026-42250/"
},
{
"type": "REPORT",
"url": "https://inbox.sourceware.org/bzip2-devel/20260528145407.293768-1-mark@klomp.org/"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8685-1"
}
],
"related": [
"USN-8685-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-42250"
]
}
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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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