CVE-2025-6966 (GCVE-0-2025-6966)
Vulnerability from cvelistv5 – Published: 2025-12-05 12:59 – Updated: 2025-12-15 22:04
VLAI
EPSS
VEX
Title
Null-pointer dereference in python-apt TagSection.keys()
Summary
NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause a denial of service (process crash) via a crafted deb822 file with a malformed non-UTF-8 key.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-05 14:01 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Canonical | python-apt |
Affected:
3.0 , < 3.0.0ubuntu1.1
(custom)
Affected: 3.0 , < 3.0.0ubuntu0.25.04.1 (custom) Affected: 2.7 , < 2.7.7ubuntu5.1 (custom) Affected: 2.4 , < 2.4.0ubuntu4.1 (custom) Affected: 2.0 , < 2.0.1ubuntu0.20.04.1+esm1 (custom) Affected: 1.6 , < 1.6.6ubuntu0.1~esm1 (custom) Affected: 1.1 , < 1.1.0~beta1ubuntu0.16.04.12+esm1 (custom) Affected: 0 , < 0.9.3.5ubuntu3+esm5 (custom) |
guessed |
Date Public
2025-12-05 12:00
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"vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "security@ubuntu.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-6966",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-12-05T14:01:32.250030Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-12-05T13:16:05.220",
"references": [
{
"source": "security@ubuntu.com",
"tags": [
"Exploit",
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/2091865"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/12/msg00019.html"
}
],
"sourceIdentifier": "security@ubuntu.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "security@ubuntu.com",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-06-28T07:11:56+00:00",
"cve": "CVE-2025-6966",
"id": "CVE-2025-6966",
"initial_release_date": "2025-12-05T12:59:41.320000+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "python-apt: python-apt: NULL pointer dereference leads to local denial of service",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-6966.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2025-12-15T22:04:15.781Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/12/msg00019.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-6966",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-12-05T14:01:32.250030Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-12-05T14:01:34.435Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://launchpad.net/ubuntu/+source/python-apt",
"defaultStatus": "unaffected",
"packageName": "python-apt",
"platforms": [
"Linux"
],
"product": "python-apt",
"vendor": "Canonical",
"versions": [
{
"lessThan": "3.0.0ubuntu1.1",
"status": "affected",
"version": "3.0",
"versionType": "custom"
},
{
"lessThan": "3.0.0ubuntu0.25.04.1",
"status": "affected",
"version": "3.0",
"versionType": "custom"
},
{
"lessThan": "2.7.7ubuntu5.1",
"status": "affected",
"version": "2.7",
"versionType": "custom"
},
{
"lessThan": "2.4.0ubuntu4.1",
"status": "affected",
"version": "2.4",
"versionType": "custom"
},
{
"lessThan": "2.0.1ubuntu0.20.04.1+esm1",
"status": "affected",
"version": "2.0",
"versionType": "custom"
},
{
"lessThan": "1.6.6ubuntu0.1~esm1",
"status": "affected",
"version": "1.6",
"versionType": "custom"
},
{
"lessThan": "1.1.0~beta1ubuntu0.16.04.12+esm1",
"status": "affected",
"version": "1.1",
"versionType": "custom"
},
{
"lessThan": "0.9.3.5ubuntu3+esm5",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Julian Andres Klode"
}
],
"datePublic": "2025-12-05T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause a denial of service (process crash) via a crafted deb822 file with a malformed non-UTF-8 key."
}
],
"impacts": [
{
"capecId": "CAPEC-153",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-153 Input Data Manipulation"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "CWE-476 NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-12-08T13:14:27.526Z",
"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
"shortName": "canonical"
},
"references": [
{
"url": "https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/2091865"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Null-pointer dereference in python-apt TagSection.keys()"
}
},
"cveMetadata": {
"assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
"assignerShortName": "canonical",
"cveId": "CVE-2025-6966",
"datePublished": "2025-12-05T12:59:41.320Z",
"dateReserved": "2025-07-01T09:59:55.552Z",
"dateUpdated": "2025-12-15T22:04:15.781Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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