Vulnerability-Lookup

GHSA-22QQ-2FWX-7P67

Vulnerability from github – Published: 2026-10-27 14:46 – Updated: 2026-10-27 14:46

Summary

Pylint: Arbitrary code execution via pickle deserialization of the stats cache in PYLINT_HOME

Details

Impact

Since 2006 / pylint 0.15.2, pylint caches its stats as pickles in PYLINT_HOME and reload them on the next run with pickle.load. Someone without access to the configuration or linted code, but with access to the cache directory (predictable PYLINT_HOME on a multi-user host) can write a crafted pickle that will runs arbitrary code when pylint access its stat cache.

Patches

From pylint 4.0.9, the result cache is now stored as JSON instead of pickle, preventing code-execution.

Workarounds

Until upgrading do not point PYLINT_HOME to an untrusted, shared, or group-writable directory. The default value, ~/.cache/pylint, is writable only by the user running pylint.

Credits

Reported privately via Tidelift coordinated disclosure (Dan Lenz).

Severity

5.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pylint"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-114608"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-27T14:46:51Z",
    "nvd_published_at": "2026-10-22T17:16:58Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nSince 2006 / pylint 0.15.2, pylint caches its stats as pickles in `PYLINT_HOME` and reload them on the next run with `pickle.load`. Someone without access to the configuration or linted code, but with access to the cache directory (predictable `PYLINT_HOME` on a multi-user host) can write a crafted pickle that will runs arbitrary code when pylint access its stat cache.\n\n### Patches\n\nFrom pylint 4.0.9, the result cache is now stored as JSON instead of pickle, preventing code-execution. \n\n### Workarounds\n\nUntil upgrading do not point `PYLINT_HOME` to an untrusted, shared, or group-writable directory. The default value, `~/.cache/pylint`, is writable only by the user running pylint.\n\n### Credits\n\n- Reported privately via Tidelift coordinated disclosure (Dan Lenz).",
  "id": "GHSA-22qq-2fwx-7p67",
  "modified": "2026-10-27T14:46:51Z",
  "published": "2026-10-27T14:46:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pylint-dev/pylint/security/advisories/GHSA-22qq-2fwx-7p67"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114608"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pylint-dev/pylint/commit/58c87cffca9de2b3e89aa07b89686cbc90cfea2d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pylint-dev/pylint/commit/5b241f66318220e9ba7b21ca631fbfe8e77682ca"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pylint-dev/pylint"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pylint-dev/pylint/releases/tag/v4.0.9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Pylint: Arbitrary code execution via pickle deserialization of the stats cache in PYLINT_HOME"
}

CVE-2026-114608 (GCVE-0-2026-114608)

Vulnerability from cvelistv5 – Published: 2026-10-22 16:50 – Updated: 2026-10-29 11:49

Title

Pylint: Arbitrary code execution via pickle deserialization of the stats cache in PYLINT_HOME

Summary

Pylint is a static code analyser for Python. From 0.15.2 until 4.0.9, Pylint stores module statistics in predictable files under PYLINT_HOME and loads those files with pickle.load on a later run. An attacker who can write to a shared, group-writable, or otherwise untrusted cache directory can replace a stats cache with crafted serialized data, causing arbitrary code to execute with the privileges of the user who next runs Pylint. The default per-user cache is not normally writable by another user. This issue is fixed in version 4.0.9.

Severity

5.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-29 11:48 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7886 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/pylint-dev/pylint/security/adv…	x_refsource_CONFIRM
https://github.com/pylint-dev/pylint/commit/58c87…	x_refsource_MISC
https://github.com/pylint-dev/pylint/commit/5b241…	x_refsource_MISC
https://github.com/pylint-dev/pylint/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pylint-dev	pylint	Affected: < 4.0.9

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-114608",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-29T11:48:00.254037Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-29T11:49:18.315Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pylint",
          "vendor": "pylint-dev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.0.9"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Pylint is a static code analyser for Python. From 0.15.2 until 4.0.9, Pylint stores module statistics in predictable files under PYLINT_HOME and loads those files with pickle.load on a later run. An attacker who can write to a shared, group-writable, or otherwise untrusted cache directory can replace a stats cache with crafted serialized data, causing arbitrary code to execute with the privileges of the user who next runs Pylint. The default per-user cache is not normally writable by another user. This issue is fixed in version 4.0.9."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502: Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-22T16:50:02.569Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pylint-dev/pylint/security/advisories/GHSA-22qq-2fwx-7p67",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pylint-dev/pylint/security/advisories/GHSA-22qq-2fwx-7p67"
        },
        {
          "name": "https://github.com/pylint-dev/pylint/commit/58c87cffca9de2b3e89aa07b89686cbc90cfea2d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pylint-dev/pylint/commit/58c87cffca9de2b3e89aa07b89686cbc90cfea2d"
        },
        {
          "name": "https://github.com/pylint-dev/pylint/commit/5b241f66318220e9ba7b21ca631fbfe8e77682ca",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pylint-dev/pylint/commit/5b241f66318220e9ba7b21ca631fbfe8e77682ca"
        },
        {
          "name": "https://github.com/pylint-dev/pylint/releases/tag/v4.0.9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pylint-dev/pylint/releases/tag/v4.0.9"
        }
      ],
      "source": {
        "advisory": "GHSA-22qq-2fwx-7p67",
        "discovery": "UNKNOWN"
      },
      "title": "Pylint: Arbitrary code execution via pickle deserialization of the stats cache in PYLINT_HOME"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-114608",
    "datePublished": "2026-10-22T16:50:02.569Z",
    "dateReserved": "2026-10-21T20:34:25.599Z",
    "dateUpdated": "2026-10-29T11:49:18.315Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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