Vulnerability-Lookup

PYSEC-2026-3721

Vulnerability from pysec - Published: 2026-07-29 19:16 - Updated: 2026-08-21 09:45

Details

pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels.

This vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone are not able to exploit this vulnerability. Note that this vulnerability only materially impacts users running pip download with the --only-binary option as installing source distributions from an untrusted index is already an unsafe operation that executes code during install time.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Impacted products

Name	purl
pip	pkg:pypi/pip

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "pip",
        "purl": "pkg:pypi/pip"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2",
        "0.2.1",
        "0.3",
        "0.3.1",
        "0.4",
        "0.5",
        "0.5.1",
        "0.6",
        "0.6.1",
        "0.6.2",
        "0.6.3",
        "0.7",
        "0.7.1",
        "0.7.2",
        "0.8",
        "0.8.1",
        "0.8.2",
        "0.8.3",
        "1.0",
        "1.0.1",
        "1.0.2",
        "1.1",
        "1.2",
        "1.2.1",
        "1.3",
        "1.3.1",
        "1.4",
        "1.4.1",
        "1.5",
        "1.5.1",
        "1.5.2",
        "1.5.3",
        "1.5.4",
        "1.5.5",
        "1.5.6",
        "10.0.0",
        "10.0.0b1",
        "10.0.0b2",
        "10.0.1",
        "18.0",
        "18.1",
        "19.0",
        "19.0.1",
        "19.0.2",
        "19.0.3",
        "19.1",
        "19.1.1",
        "19.2",
        "19.2.1",
        "19.2.2",
        "19.2.3",
        "19.3",
        "19.3.1",
        "20.0",
        "20.0.1",
        "20.0.2",
        "20.1",
        "20.1.1",
        "20.1b1",
        "20.2",
        "20.2.1",
        "20.2.2",
        "20.2.3",
        "20.2.4",
        "20.2b1",
        "20.3",
        "20.3.1",
        "20.3.2",
        "20.3.3",
        "20.3.4",
        "20.3b1",
        "21.0",
        "21.0.1",
        "21.1",
        "21.1.1",
        "21.1.2",
        "21.1.3",
        "21.2",
        "21.2.1",
        "21.2.2",
        "21.2.3",
        "21.2.4",
        "21.3",
        "21.3.1",
        "22.0",
        "22.0.1",
        "22.0.2",
        "22.0.3",
        "22.0.4",
        "22.1",
        "22.1.1",
        "22.1.2",
        "22.1b1",
        "22.2",
        "22.2.1",
        "22.2.2",
        "22.3",
        "22.3.1",
        "23.0",
        "23.0.1",
        "23.1",
        "23.1.1",
        "23.1.2",
        "23.2",
        "23.2.1",
        "23.3",
        "23.3.1",
        "23.3.2",
        "24.0",
        "24.1",
        "24.1.1",
        "24.1.2",
        "24.1b1",
        "24.1b2",
        "24.2",
        "24.3",
        "24.3.1",
        "25.0",
        "25.0.1",
        "25.1",
        "25.1.1",
        "25.2",
        "25.3",
        "26.0",
        "26.0.1",
        "26.1",
        "26.1.1",
        "26.1.2",
        "6.0",
        "6.0.1",
        "6.0.2",
        "6.0.3",
        "6.0.4",
        "6.0.5",
        "6.0.6",
        "6.0.7",
        "6.0.8",
        "6.1.0",
        "6.1.1",
        "7.0.0",
        "7.0.1",
        "7.0.2",
        "7.0.3",
        "7.1.0",
        "7.1.1",
        "7.1.2",
        "8.0.0",
        "8.0.1",
        "8.0.2",
        "8.0.3",
        "8.1.0",
        "8.1.1",
        "8.1.2",
        "9.0.0",
        "9.0.1",
        "9.0.2",
        "9.0.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-13346",
    "GHSA-qwm4-qh6w-59xr"
  ],
  "details": "pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels.\n\n\n\n\nThis vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone are not able to exploit this vulnerability. Note that this vulnerability only materially impacts users running `pip download` with the `--only-binary` option as installing source distributions from an untrusted index is already an unsafe operation that executes code during install time.",
  "id": "PYSEC-2026-3721",
  "modified": "2026-08-21T09:45:32.276278Z",
  "published": "2026-07-29T19:16:44.267Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/29/7"
    },
    {
      "type": "ADVISORY",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/L2BNQGGVQCEV7DROOORQ7WFKKFF2OOQX/"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pypa/pip/pull/14110"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-qwm4-qh6w-59xr"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-13346 (GCVE-0-2026-13346)

Vulnerability from cvelistv5 – Published: 2026-07-29 18:33 – Updated: 2026-07-29 20:21

Title

pip absolute path traversal during download from malicious package indexes

Summary

pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels. This vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone are not able to exploit this vulnerability. Note that this vulnerability only materially impacts users running `pip download` with the `--only-binary` option as installing source distributions from an untrusted index is already an unsafe operation that executes code during install time.

Severity

5.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 19:08 UTC

CWE

CWE-36 - Absolute path traversal

Assigner

PSF mitre root

References

3 references

URL	Tags
https://github.com/pypa/pip/pull/14110	patch
https://mail.python.org/archives/list/security-an…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/07/29/7

Impacted products

1 product

Vendor	Product	Version
Python Packaging Authority	pip	Affected: 0 , < 26.2 (python)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-13346",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-29T19:08:27.143201Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-29T19:08:36.192Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "cna": {
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          "defaultStatus": "unaffected",
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          "repo": "https://github.com/pypa/pip",
          "vendor": "Python Packaging Authority",
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            {
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      "metrics": [
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            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 5.6,
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            "exploitMaturity": "NOT_DEFINED",
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GHSA-QWM4-QH6W-59XR

Vulnerability from github – Published: 2026-07-29 21:30 – Updated: 2026-09-01 18:57

Summary

pip would incorrectly handle doubly-encoded package URLs from indexes

Details

pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels.

Severity

5.6 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pip"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-13346"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-36"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-01T18:57:42Z",
    "nvd_published_at": "2026-07-29T19:16:44Z",
    "severity": "MODERATE"
  },
  "details": "pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels.\n\nThis vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone are not able to exploit this vulnerability. Note that this vulnerability only materially impacts users running `pip download` with the `--only-binary` option as installing source distributions from an untrusted index is already an unsafe operation that executes code during install time.",
  "id": "GHSA-qwm4-qh6w-59xr",
  "modified": "2026-09-01T18:57:42Z",
  "published": "2026-07-29T21:30:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13346"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/pip/pull/14110"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/pip/commit/10dfb6b9005484578b386f64b9f36982e3dc6679"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/pip/PYSEC-2026-3721.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pypa/pip"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/L2BNQGGVQCEV7DROOORQ7WFKKFF2OOQX"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/29/7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pip would incorrectly handle doubly-encoded package URLs from indexes"
}

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.

Detection rules are retrieved from Rulezet.

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.

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.

Action not permitted

PYSEC-2026-3721

CVE-2026-13346 (GCVE-0-2026-13346)

GHSA-QWM4-QH6W-59XR

Tags

Sightings

Nomenclature

Related by attack behaviour