Vulnerability-Lookup

GHSA-WQXF-PJXH-HH4H

Vulnerability from github – Published: 2026-06-24 00:30 – Updated: 2026-06-30 18:31

Details

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, meaning an archive could be parsed in an infinite loop.

Severity ?

8.2 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-11972"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-252"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-23T23:16:49Z",
    "severity": "HIGH"
  },
  "details": "When using the \"tarfile\" module with a file opened in \"streaming mode\" (mode=\"r|\") the tarfile module did not properly handle EOF, meaning an archive could be parsed in an infinite loop.",
  "id": "GHSA-wqxf-pjxh-hh4h",
  "modified": "2026-06-30T18:31:33Z",
  "published": "2026-06-24T00:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11972"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/151981"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/151982"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/3f031d431f80668e14f3bc066bbf4369cd9281b9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/4ce6bf7c8aa7725828a38981c306f214c1f29365"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/7f0dc59c9a70f8f3b4da33d7c4a2ba552a7acc21"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/e86666c9dd256d52d0fbef6feb1ea4a51768fdec"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/eb63c0f94dfcbea7fda8eab6213818e134d67192"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/f50bf13566189c8d0ce5a814f33eff3d89951896"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-11972 (GCVE-0-2026-11972)

Vulnerability from cvelistv5 – Published: 2026-06-23 22:02 – Updated: 2026-06-30 15:13

Title

tarfile opened in streaming mode mishandles EOF

Summary

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.

Severity ?

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

Assigner

PSF

References

URL

Tags

	https://github.com/python/cpython/issues/151981	issue-tracking
	https://github.com/python/cpython/pull/151982	patch
	https://mail.python.org/archives/list/security-an…	vendor-advisory
	https://github.com/python/cpython/commit/3f031d43…	patch
	https://github.com/python/cpython/commit/4ce6bf7c…	patch
	https://github.com/python/cpython/commit/7f0dc59c…	patch
	https://github.com/python/cpython/commit/e86666c9…	patch
	https://github.com/python/cpython/commit/eb63c0f9…	patch
	https://github.com/python/cpython/commit/f50bf135…	patch

Impacted products

	Vendor	Product	Version
	Python Software Foundation	CPython	Affected: 0 , < 3.15.0 (python)

Credits

Ryan Hileman (https://github.com/lunixbochs) Petr Viktorin (https://github.com/encukou) Stan Ulbrych (https://github.com/StanFromIreland)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-11972",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-24T15:33:49.665045Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
          "dateUpdated": "2026-06-24T15:34:06.959Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "modules": [
            "tarfile"
          ],
          "product": "CPython",
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
          "versions": [
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              "version": "0",
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            }
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      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Ryan Hileman (https://github.com/lunixbochs)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Petr Viktorin (https://github.com/encukou)"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
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      ],
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      "metrics": [
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          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "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: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"
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          "scenarios": [
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          "url": "https://github.com/python/cpython/pull/151982"
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          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/"
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        },
        {
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      "title": "tarfile opened in streaming mode mishandles EOF",
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        "engine": "cvelib 1.8.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
    "assignerShortName": "PSF",
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    "datePublished": "2026-06-23T22:02:45.434Z",
    "dateReserved": "2026-06-11T11:35:05.520Z",
    "dateUpdated": "2026-06-30T15:13:21.383Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-WQXF-PJXH-HH4H

CVE-2026-11972 (GCVE-0-2026-11972)

Tags

Sightings

Nomenclature