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Rancher Extensions have arbitrary file access via path traversal

Type: advisorySources: OSV

A vulnerability has been identified in [Rancher's Extensions](https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions) where malicious code can be injected in Rancher through a path traversal in the `compressedEndpoint` field inside a `UIPlugin` deployment. A malicious UI extension could abuse that to: * Overwrite Rancher binaries or configuration to inject code. * Write to /var/lib/rancher/ to tamper with cluster state. * If hostPath volumes are mounted, write to the host node filesystem. * Use this issue to chain with other attack vectors.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-25705
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 15:07 UTC · Revision 1

Source evidence

Rancher Extensions have arbitrary file access via path traversal

core-osv · Original source

Published 13 May 2026, 08:00 UTC

A vulnerability has been identified in [Rancher's Extensions](https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions) where malicious code can be injected in Rancher through a path traversal in the `compressedEndpoint` field inside a `UIPlugin` deployment. A malicious UI extension could abuse that to: * Overwrite Rancher binaries or configuration to inject code. * Write to /var/lib/rancher/ to tamper with cluster state. * If hostPath volumes are mounted, write to the host node filesystem. * Use this issue to chain with other attack vectors.

osv:CVE-2026-25705
Complete source record
{
  "id": "aceff4c171551586429caff3f7a0ba13fa603923a3731cd4ba9a15b08e4d1008",
  "url": "https://osv.dev/vulnerability/CVE-2026-25705",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Rancher Extensions have arbitrary file access via path traversal",
    "summary": "A vulnerability has been identified in [Rancher's Extensions](https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions) where malicious code can be injected in Rancher through a path traversal in the `compressedEndpoint` field inside a `UIPlugin` deployment. A malicious UI extension could abuse that to: * Overwrite Rancher binaries or configuration to inject code. * Write to /var/lib/rancher/ to tamper with cluster state. * If hostPath volumes are mounted, write to the host node filesystem. * Use this issue to chain with other attack vectors.",
    "evidence": "osv:CVE-2026-25705",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-25705",
      "aliases": [
        "CVE-2026-25705",
        "GHSA-5v3h-x4wf-5c35",
        "GO-2026-5154"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rancher/rancher",
              "type": "GIT",
              "events": [
                {
                  "introduced": "19d8a9c03fde57ab691101dc90a17b92c55f09ad"
                },
                {
                  "fixed": "9cf8959713c9152622ce8337c3242da7e44944c1"
                },
                {
                  "introduced": "f94ac947f75e312f1ab9217d21b2770b48b734c8"
                },
                {
                  "fixed": "8dbcbe437d063f86acf5da89ce686c2601a18010"
                },
                {
                  "introduced": "8815e66bf2e4b528493cf11222f1a63f86305a9f"
                },
                {
                  "fixed": "db2754edc35189187bb10c524601d3d62642ff9b"
                },
                {
                  "introduced": "55b9e241c5577600197c77f4b33dc55e80a35dd0"
                },
                {
                  "fixed": "656bed78295984ab2325c88fc63f3a5f208dd128"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.14.0"
                      },
                      {
                        "fixed": "2.14.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.13.0"
                      },
                      {
                        "fixed": "2.13.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.12.0"
                      },
                      {
                        "fixed": "2.12.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.10.11"
                      },
                      {
                        "fixed": "2.11.13"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.13.3",
            "v2.14.1-rc2",
            "v2.14.1-rc1",
            "v2.13.5-rc1",
            "v2.12.9-rc1",
            "v2.14.1-alpha13",
            "v2.14.1-alpha12",
            "v2.12.9-alpha7",
            "v2.13.5-alpha7",
            "v2.14.1-alpha11",
            "v2.14.1-alpha10",
            "v2.14.1-alpha9",
            "v2.14.1-alpha8",
            "v2.13.5-alpha6",
            "v2.12.9-alpha6",
            "v2.14.1-alpha7",
            "v2.14.1-alpha6",
            "v2.14.1-alpha5",
            "v2.13.5-alpha5",
            "v2.12.9-alpha5",
            "v2.12.9-alpha4",
            "v2.13.5-alpha4",
            "v2.14.1-alpha4",
            "v2.12.9-alpha3",
            "v2.13.5-alpha3",
            "v2.14.1-alpha3",
            "v2.13.5-alpha2",
            "v2.12.9-alpha2",
            "v2.12.9-alpha1",
            "v2.13.5-alpha1",
            "v2.14.1-alpha2",
            "v2.14.1-alpha1",
            "v2.12.8",
            "v2.14.0",
            "v2.13.4",
            "v2.13.4-rc1",
            "v2.12.8-rc1",
            "v2.13.4-alpha5",
            "v2.13.4-alpha4",
            "v2.13.4-alpha3",
            "v2.13.4-alpha2",
            "v2.12.8-alpha2",
            "v2.13.4-alpha1",
            "v2.12.8-alpha1",
            "v2.12.7",
            "v2.12.7-rc1",
            "v2.13.3-rc3",
            "v2.13.3-rc2",
            "v2.13.3-rc1",
            "v2.13.3-alpha6",
            "v2.13.3-alpha5",
            "v2.12.7-alpha3",
            "v2.12.7-alpha2",
            "v2.13.3-alpha4",
            "v2.13.3-alpha3",
            "v2.13.3-alpha2",
            "v2.13.3-alpha1",
            "v2.12.7-alpha1",
            "v2.13.2-rc2",
            "v2.13.2",
            "v2.12.6-rc2",
            "v2.12.6",
            "v2.12.6-rc1",
            "v2.13.2-rc1",
            "v2.13.2-alpha7",
            "v2.13.2-alpha6",
            "v2.12.6-alpha2",
            "v2.13.2-alpha5",
            "v2.12.5",
            "v2.12.6-alpha1",
            "v2.13.2-alpha4",
            "v2.13.2-alpha3",
            "v2.13.2-alpha2",
            "v2.13.2-alpha1",
            "v2.12.4-hotfix-a3c0.1",
            "v2.12.4",
            "v2.13.1",
            "v2.12.5-rc1",
            "v2.13.1-rc1",
            "v2.13.1-alpha7",
            "v2.13.1-alpha6",
            "v2.13.1-alpha5",
            "v2.13.1-alpha4",
            "v2.13.1-alpha3",
            "v2.13.1-alpha2",
            "v2.12.5-alpha2",
            "v2.13.1-alpha1",
            "v2.12.5-alpha1",
            "v2.13.0-rc4",
            "v2.13.0",
            "v2.12.4-rc1",
            "v2.12.4-alpha6",
            "v2.12.4-alpha5",
            "v2.12.4-alpha4",
            "v2.12.4-alpha3",
            "v2.12.4-alpha2",
            "v2.12.4-alpha1",
            "v2.12.3",
            "v2.12.3-rc1",
            "v2.12.3-alpha2",
            "v2.12.2",
            "v2.12.3-alpha1",
            "v2.12.2-rc2",
            "v2.12.2-rc1",
            "v2.12.2-alpha5",
            "v2.12.2-alpha4",
            "v2.12.2-alpha3",
            "v2.12.2-alpha2",
            "v2.12.2-alpha1",
            "v2.12.1",
            "v2.12.1-rc1",
            "v2.12.1-alpha4",
            "v2.12.1-alpha3",
            "v2.12.1-alpha2",
            "v2.12.1-alpha1",
            "v2.12.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25705.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.996953962Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25705.json",
        "https://github.com/rancher/rancher/security/advisories/GHSA-5v3h-x4wf-5c35",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25705",
        "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-25705"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-35"
        ],
        "cna_assigner": "suse",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25705.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25705",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496667,
  "published_at": "2026-05-13T08:00:46.097+00:00"
}