CVE-2026-114583 (GCVE-0-2026-114583)

Vulnerability from cvelistv5 – Published: 2026-10-22 20:57 – Updated: 2026-10-27 00:36
VLAI
Title
tar filter allows writing outside destination via empty-named symlink
Summary
tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() with filter="tar" to write files outside the destination directory, subject to the permissions of the extracting process. This is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter.
Severity
6.9 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Assigner
PSF CNA under the mitre root
CNA scorecard B 80/100 over 28 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Python Software Foundation CPython Affected: 0 , < 3.11.18 (python)
Affected: 3.12.0 , < 3.12.16 (python)
Affected: 3.13.0 , < 3.13.18 (python)
Affected: 3.14.0 , < 3.14.10 (python)
Affected: 3.15.0 , < 3.15.2 (python)
Affected: 3.16.0a1 , < 3.16.0 (python)
guessed Create a notification for this product.
Credits
Stan Ulbrych (https://github.com/StanFromIreland) Ethan Furman (https://github.com/ethanfurman)
Show details on NVD website
To clipboard 

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "tarfile"
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          "product": "CPython",
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
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      "credits": [
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          "type": "coordinator",
          "value": "Stan Ulbrych (https://github.com/StanFromIreland)"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Ethan Furman (https://github.com/ethanfurman)"
        }
      ],
      "descriptions": [
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          "supportingMedia": [
            {
              "type": "text/html",
              "value": "tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() with filter=\"tar\" to write files outside the destination directory, subject to the permissions of the extracting process.\u003cbr\u003e\u003cbr\u003eThis is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter."
            }
          ],
          "value": "tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() with filter=\"tar\" to write files outside the destination directory, subject to the permissions of the extracting process.\n\nThis is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter."
        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "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:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "shortName": "PSF"
      },
      "references": [
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          "url": "https://github.com/python/cpython/pull/160098"
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          "tags": [
            "issue-tracking"
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          "url": "https://github.com/python/cpython/issues/160097"
        },
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          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/43JOWPRAV5DI3VZ4FUEUAZOHCATXXOCK/"
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          "url": "https://github.com/python/cpython/commit/0901ad4ffb22605f12b705d1c1197f0a01f0ba0b"
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "tar filter allows writing outside destination via empty-named symlink",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
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  "cveMetadata": {
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    "assignerShortName": "PSF",
    "cveId": "CVE-2026-114583",
    "datePublished": "2026-10-22T20:57:36.019Z",
    "dateReserved": "2026-10-21T18:58:26.985Z",
    "dateUpdated": "2026-10-27T00:36:15.766Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-10-30",
      "epss": "0.00227",
      "percentile": "0.13507"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-30T01:45:06.000Z",
      "cve": "CVE-2026-114583",
      "id": "msrc_CVE-2026-114583",
      "initial_release_date": "2026-10-24T01:01:36.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tar filter allows writing outside destination via empty-named symlink",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-114583.json",
      "version": "6"
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          }
        ],
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        "lastModified": "2026-10-27T01:19:05.420",
        "metrics": {
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                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
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                "attackRequirements": "NONE",
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                "availabilityRequirement": "NOT_DEFINED",
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                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
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                "valueDensity": "NOT_DEFINED",
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                "version": "4.0",
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                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "source": "cna@python.org",
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        "published": "2026-10-22T21:17:16.543",
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      "current_release_date": "2026-10-23T16:27:44Z",
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      "id": "CVE-2026-114583",
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      "product_status:known_affected": "323",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-114583",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-114583.json",
      "version": "2"
    }
  }
}



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