CVE-2026-87910
Full vulnerability record from the local CVENow database.
Description
When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.
Severity
MEDIUM
CVSS score
5.7
(v4.0)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-09-11 18:16:59.800000
Last modified
2026-10-22 01:16:59.773000
View original CVE JSON
{
"id": "CVE-2026-87910",
"sourceIdentifier": "[email protected]",
"published": "2026-09-11T18:16:59.800",
"lastModified": "2026-10-22T01:16:59.773",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Python Software Foundation",
"product": "CPython",
"defaultStatus": "unaffected",
"modules": [
"tarfile"
],
"repo": "https://github.com/python/cpython",
"versions": [
{
"version": "0",
"lessThan": "3.10.22",
"versionType": "python",
"status": "affected"
},
{
"version": "3.11.0",
"lessThan": "3.11.17",
"versionType": "python",
"status": "affected"
},
{
"version": "3.12.0",
"lessThan": "3.12.15",
"versionType": "python",
"status": "affected"
},
{
"version": "3.13.0",
"lessThan": "3.13.16",
"versionType": "python",
"status": "affected"
},
{
"version": "3.14.0",
"lessThan": "3.14.9",
"versionType": "python",
"status": "affected"
},
{
"version": "3.15.0a1",
"lessThan": "3.15.0rc3",
"versionType": "python",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/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",
"baseScore": 5.7,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"privilegesRequired": "LOW",
"userInteraction": "ACTIVE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-09-11T19:23:39.973519Z",
"id": "CVE-2026-87910",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-22"
},
{
"lang": "en",
"value": "CWE-59"
}
]
}
],
"references": [
{
"url": "https://github.com/python/cpython/commit/2eb0c2f1dc71847731b6ab30aebefd058d482a7f",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/3105a3498aaf681ce128cf5baf83c2e5574267c5",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/764fd0af8d9e19d3684a58d2e58bf770f0605036",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/9c17bace90f88dfba6d0e2fe23c8e7ae35f83955",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/a4919937a4e1e69a0d178909c6f20557eca5d1d0",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/c1f106d240c4ffcb3608ed0a20e8aba6c865f6d3",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/d9565e54b1fc6d63c5be9afd58114499128fa57b",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/issues/157265",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/pull/157266",
"source": "[email protected]"
},
{
"url": "https://mail.python.org/archives/list/[email protected]/thread/57TBTLL2W6APMZR3A25B2YV7GL3EPTDJ/",
"source": "[email protected]"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/09/11/8",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
]
}