Vulnerability-Lookup

CVE-2026-68939 (GCVE-0-2026-68939)

Vulnerability from cvelistv5 – Published: 2026-08-18 15:11 – Updated: 2026-08-18 18:46

Title

Pyenv: Glob/wildcard metacharacters bypass is_version_safe(), causing silent version/interpreter substitution via unquoted expansion (CVE-2022-35861 residual)

Summary

Pyenv provides simple Python version management. Prior to 2.8.0, is_version_safe() in libexec/pyenv-version-file-read accepts shell glob metacharacters in .python-version values, and unquoted PYENV_VERSION expansion in libexec/pyenv-version-name, libexec/pyenv-which, libexec/pyenv-prefix, libexec/pyenv-local, libexec/pyenv-global, libexec/pyenv-version, and libexec/pyenv-versions pathname-expands the value against the current directory, allowing a matching attacker-controlled file to silently select a different installed interpreter or version. This issue is fixed in version 2.8.0.

Severity

2 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 18:45 UTC

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CWE-155 - Improper Neutralization of Wildcards or Matching Symbols

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/pyenv/pyenv/security/advisorie…	x_refsource_CONFIRM
https://github.com/pyenv/pyenv/commit/95df7dbc7b3…	x_refsource_MISC
https://github.com/pyenv/pyenv/releases/tag/v2.8.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pyenv	pyenv	Affected: < 2.8.0

Show details on NVD website

JSON

To clipboard

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EUVD-2026-355143

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:26

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:26:28.736773+00:00",
  "id": "EUVD-2026-355143"
}

FKIE_CVE-2026-68939

Vulnerability from fkie_nvd - Published: 2026-08-18 15:17 - Updated: 2026-09-18 20:05

Severity

2.0 (Low) - CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/pyenv/pyenv/commit/95df7dbc7b34595b47c9b922de198547effda819
	security-advisories@github.com	https://github.com/pyenv/pyenv/releases/tag/v2.8.0
	security-advisories@github.com	https://github.com/pyenv/pyenv/security/advisories/GHSA-g478-f579-9vp9
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/pyenv/pyenv/security/advisories/GHSA-g478-f579-9vp9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "affectedData": [
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          "vendor": "pyenv",
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          "role": "CISA Coordinator",
          "timestamp": "2026-08-18T18:45:54.610692Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-18T15:17:00.790",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pyenv/pyenv/commit/95df7dbc7b34595b47c9b922de198547effda819"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pyenv/pyenv/releases/tag/v2.8.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pyenv/pyenv/security/advisories/GHSA-g478-f579-9vp9"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/pyenv/pyenv/security/advisories/GHSA-g478-f579-9vp9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        },
        {
          "lang": "en",
          "value": "CWE-88"
        },
        {
          "lang": "en",
          "value": "CWE-155"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

OPENSUSE-SU-2026:11613-1

Vulnerability from csaf_opensuse - Published: 2026-08-26 00:00 - Updated: 2026-09-17 17:21

Summary

pyenv-2.8.4-1.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-68939.

CVE-2026-68939

5.3 (Medium)


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

Recommended: 16 products

Open the full advisory

OPENSUSE-SU-2026:21664-1

Vulnerability from csaf_opensuse - Published: 2026-08-26 15:47 - Updated: 2026-09-17 17:42

Summary

Security update for pyenv

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-68939.

CVE-2026-68939

5.3 (Medium)


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

Recommended: 7 products

Open the full advisory

UBUNTU-CVE-2026-68939 (CVE-2026-68939)

Vulnerability from osv_ubuntu – Published: 2026-08-18 15:17 – Updated: 2026-09-02 16:23 – Source website

Details

Severity

2.0 (Low)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-68939	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-68939	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pyenv",
            "binary_version": "2.6.8-1"
          },
          {
            "binary_name": "pyenv-runtime",
            "binary_version": "2.6.8-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "pyenv",
        "purl": "pkg:deb/ubuntu/pyenv@2.6.8-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.4-1build1",
        "2.6.8-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Pyenv provides simple Python version management. Prior to 2.8.0, is_version_safe() in libexec/pyenv-version-file-read accepts shell glob metacharacters in .python-version values, and unquoted PYENV_VERSION expansion in libexec/pyenv-version-name, libexec/pyenv-which, libexec/pyenv-prefix, libexec/pyenv-local, libexec/pyenv-global, libexec/pyenv-version, and libexec/pyenv-versions pathname-expands the value against the current directory, allowing a matching attacker-controlled file to silently select a different installed interpreter or version. This issue is fixed in version 2.8.0.",
  "id": "UBUNTU-CVE-2026-68939",
  "modified": "2026-09-02T16:23:49Z",
  "published": "2026-08-18T15:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-68939"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68939"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-68939"
  ]
}

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.

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

CVE-2026-68939 (GCVE-0-2026-68939)

EUVD-2026-355143

FKIE_CVE-2026-68939

OPENSUSE-SU-2026:11613-1

OPENSUSE-SU-2026:21664-1

UBUNTU-CVE-2026-68939 (CVE-2026-68939)

Tags

Sightings

Nomenclature

Related by attack behaviour