ubuntu-cve-2025-54363
Vulnerability from osv_ubuntu
Published
2025-08-20 03:15
Modified
2026-05-20 15:22
Summary
Details
Microsoft Knack 0.12.0 allows Regular expression Denial of Service (ReDoS) in the knack.introspection module. extract_full_summary_from_signature employs an inefficient regular expression pattern: "\s(:param)\s+(.+?)\s:(.*)" that is susceptible to catastrophic backtracking when processing crafted docstrings containing a large volume of whitespace without a terminating colon. An attacker who can control or inject docstring content into affected applications can trigger excessive CPU consumption. This software is used by Azure CLI.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-knack",
"binary_version": "0.6.3-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "knack",
"purl": "pkg:deb/ubuntu/knack@0.6.3-2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.2-1ubuntu1",
"0.6.3-1ubuntu1",
"0.6.3-2~build1",
"0.6.3-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-knack",
"binary_version": "0.9.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "knack",
"purl": "pkg:deb/ubuntu/knack@0.9.0-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.8.0~rc2-1",
"0.9.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-knack",
"binary_version": "0.11.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "knack",
"purl": "pkg:deb/ubuntu/knack@0.11.0-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.11.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-knack",
"binary_version": "0.12.0-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "knack",
"purl": "pkg:deb/ubuntu/knack@0.12.0-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.12.0-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-knack",
"binary_version": "0.13.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "knack",
"purl": "pkg:deb/ubuntu/knack@0.13.0-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.12.0-2",
"0.13.0-1"
]
}
],
"aliases": [],
"details": "Microsoft Knack 0.12.0 allows Regular expression Denial of Service (ReDoS) in the knack.introspection module. extract_full_summary_from_signature employs an inefficient regular expression pattern: \"\\s(:param)\\s+(.+?)\\s:(.*)\" that is susceptible to catastrophic backtracking when processing crafted docstrings containing a large volume of whitespace without a terminating colon. An attacker who can control or inject docstring content into affected applications can trigger excessive CPU consumption. This software is used by Azure CLI.",
"id": "UBUNTU-CVE-2025-54363",
"modified": "2026-05-20T15:22:55Z",
"published": "2025-08-20T03:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-54363"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-54363"
},
{
"type": "REPORT",
"url": "https://github.com/microsoft/knack"
},
{
"type": "REPORT",
"url": "https://www.vulncheck.com/advisories/microsoft-knack-python-package-regular-expression-dos"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2025-54363"
]
}
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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.
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- 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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