CVE-2026-3087 (GCVE-0-2026-3087)
Vulnerability from cvelistv5 – Published: 2026-04-27 20:46 – Updated: 2026-08-13 00:28
VLAI
EPSS
VEX
Title
shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
Summary
If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-28 13:38 UTC
CWE
Assigner
References
14 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.21
(python)
Affected: 3.11.0 , < 3.11.16 (python) Affected: 3.12.0 , < 3.12.14 (python) Affected: 3.13.0 , < 3.13.14 (python) Affected: 3.14.0a1 , < 3.14.5rc1 (python) Affected: 3.15.0a1 , < 3.15.0b1 (python) |
guessed |
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"versionType": "python"
},
{
"lessThan": "3.15.0b1",
"status": "affected",
"version": "3.15.0a1",
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}
]
}
],
"credits": [
{
"lang": "en",
"type": "remediation developer",
"value": "Serhiy Storchaka (https://github.com/serhiy-storchaka)"
},
{
"lang": "en",
"type": "coordinator",
"value": "Seth Larson (https://github.com/sethmlarson)"
},
{
"lang": "en",
"type": "reporter",
"value": "GGAutomaton (https://github.com/GGAutomaton)"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability."
}
],
"value": "If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability."
}
],
"metrics": [
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
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"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6,
"baseSeverity": "MEDIUM",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
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"lang": "en",
"value": "GENERAL"
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]
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"descriptions": [
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"cweId": "CWE-22",
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"references": [
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"url": "https://github.com/python/cpython/pull/146591"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/python/cpython/issues/146581"
},
{
"tags": [
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],
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/"
},
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},
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],
"url": "https://github.com/python/cpython/commit/1071290169f85c09cf767c1099564a9426cdc7e8"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "shutil.unpack_archive() doesn\u0027t check for Windows absolute paths in ZIPs",
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},
"cveMetadata": {
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"assignerShortName": "PSF",
"cveId": "CVE-2026-3087",
"datePublished": "2026-04-27T20:46:43.201Z",
"dateReserved": "2026-02-23T23:14:46.433Z",
"dateUpdated": "2026-08-13T00:28:13.615Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
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}
}
}
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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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