Vulnerability-Lookup

CVE-2026-53956 (GCVE-0-2026-53956)

Vulnerability from cvelistv5 – Published: 2026-09-09 20:47 – Updated: 2026-09-10 13:50

Title

Rattler vulnerable to package cache path traversal via conda package build string

Summary

Rattler is a library that provides common functionality used within the conda ecosystem. `rattler_cache` prior to version 0.9.0 and `py-rattler` prior to version 0.24.0 were vulnerable to package-cache path traversal when handling package metadata from conda channels. During cache materialization, the `ratter_cache` code used the package record `build` string as part of a cache key that was joined into a filesystem path. A malicious or untrusted channel could publish repodata with path separators or traversal components in that field, causing package contents to be written outside the configured package cache directory. The issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form. Users should upgrade to `rattler_cache` version 0.9.0 or `py-rattler` version 0.24.0 and avoid untrusted conda channels.

Severity

5.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 13:50 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-73 - External Control of File Name or Path

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/conda/rattler/security/advisor…	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version	CPE status
conda	rattler_cache	Affected: < 0.9.0	guessed
conda	py-rattler	Affected: < 0.24.0	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-53956",
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FKIE_CVE-2026-53956

Vulnerability from fkie_nvd - Published: 2026-09-09 21:17 - Updated: 2026-09-10 15:53

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/conda/rattler/security/advisories/GHSA-h672-p7h7-97v9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "rattler_cache",
          "vendor": "conda",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.9.0"
            }
          ]
        },
        {
          "product": "py-rattler",
          "vendor": "conda",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.24.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rattler is a library that provides common functionality used within the conda ecosystem. `rattler_cache` prior to version 0.9.0 and `py-rattler` prior to version 0.24.0 were vulnerable to package-cache path traversal when handling package metadata from conda channels. During cache materialization, the `ratter_cache` code used the package record `build` string as part of a cache key that was joined into a filesystem path. A malicious or untrusted channel could publish repodata with path separators or traversal components in that field, causing package contents to be written outside the configured package cache directory. The issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form. Users should upgrade to `rattler_cache` version 0.9.0 or `py-rattler` version 0.24.0 and avoid untrusted conda channels."
    }
  ],
  "id": "CVE-2026-53956",
  "lastModified": "2026-09-10T15:53:23.707",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-53956",
          "options": [
            {
              "exploitation": "none"
            },
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            },
            {
              "technicalImpact": "partial"
            }
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          "role": "CISA Coordinator",
          "timestamp": "2026-09-10T13:50:50.765651Z",
          "version": "2.0.3"
        }
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  },
  "published": "2026-09-09T21:17:03.180",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/conda/rattler/security/advisories/GHSA-h672-p7h7-97v9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
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        },
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}

GHSA-H672-P7H7-97V9

Vulnerability from github – Published: 2026-07-09 23:20 – Updated: 2026-07-09 23:20

Summary

Rattler vulnerable to package cache path traversal via conda package build string

Details

rattler_cache and py-rattler were vulnerable to package-cache path traversal when handling package metadata from conda channels.

During cache materialization, the ratter_cache code used the package record build string as part of a cache key that was joined into a filesystem path. A malicious or untrusted channel could publish repodata with path separators or traversal components in that field, causing package contents to be written outside the configured package cache directory.

The issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form.

Users should upgrade to a patched version and avoid untrusted conda channels.

Severity

5.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.8.2"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "rattler_cache"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.23.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "py_rattler"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.24.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53956"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-73"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-09T23:20:12Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "`rattler_cache` and `py-rattler` were vulnerable to package-cache path traversal when handling package metadata from conda channels.\n\nDuring cache materialization, the `ratter_cache` code used the package record `build` string as part of a cache key that was joined into a filesystem path. A malicious or untrusted channel could publish repodata with path separators or traversal components in that field, causing package contents to be written outside the configured package cache directory.\n\nThe issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form.\n\nUsers should upgrade to a patched version and avoid untrusted conda channels.",
  "id": "GHSA-h672-p7h7-97v9",
  "modified": "2026-07-09T23:20:12Z",
  "published": "2026-07-09T23:20:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/conda/rattler/security/advisories/GHSA-h672-p7h7-97v9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/conda/rattler"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rattler vulnerable to package cache path traversal via conda package build string"
}

PYSEC-2026-2970

Vulnerability from pysec - Published: 2026-07-13 15:46 - Updated: 2026-07-13 16:05

Details

rattler_cache and py-rattler were vulnerable to package-cache path traversal when handling package metadata from conda channels.

The issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form.

Users should upgrade to a patched version and avoid untrusted conda channels.

Severity

5.4 (Medium)


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

Impacted products

Name	purl
py-rattler	pkg:pypi/py-rattler

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "py-rattler",
        "purl": "pkg:pypi/py-rattler"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.24.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.1",
        "0.1.2",
        "0.10.0",
        "0.11.0",
        "0.12.0",
        "0.13.0",
        "0.13.1",
        "0.14.0",
        "0.15.0",
        "0.16.0",
        "0.17.0",
        "0.18.0",
        "0.19.0",
        "0.2.0",
        "0.2.1",
        "0.20.0",
        "0.21.0",
        "0.22.0",
        "0.23.0",
        "0.23.1",
        "0.23.2",
        "0.3.0",
        "0.4.0",
        "0.5.0",
        "0.6.0",
        "0.6.1",
        "0.6.2",
        "0.6.3",
        "0.7.0",
        "0.7.1",
        "0.7.2",
        "0.8.0",
        "0.8.2",
        "0.9.0",
        "0.9.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53956",
    "GHSA-h672-p7h7-97v9"
  ],
  "details": "`rattler_cache` and `py-rattler` were vulnerable to package-cache path traversal when handling package metadata from conda channels.\n\nDuring cache materialization, the `ratter_cache` code used the package record `build` string as part of a cache key that was joined into a filesystem path. A malicious or untrusted channel could publish repodata with path separators or traversal components in that field, causing package contents to be written outside the configured package cache directory.\n\nThe issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form.\n\nUsers should upgrade to a patched version and avoid untrusted conda channels.",
  "id": "PYSEC-2026-2970",
  "modified": "2026-07-13T16:05:50.063696Z",
  "published": "2026-07-13T15:46:30.375344Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/conda/rattler/security/advisories/GHSA-h672-p7h7-97v9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/conda/rattler"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/py-rattler"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-h672-p7h7-97v9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53956"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rattler vulnerable to package cache path traversal via conda package build string"
}

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.

Action not permitted

CVE-2026-53956 (GCVE-0-2026-53956)

FKIE_CVE-2026-53956

GHSA-H672-P7H7-97V9

PYSEC-2026-2970

Tags

Sightings

Nomenclature