Vulnerability-Lookup

CVE-2026-88014 (GCVE-0-2026-88014)

Vulnerability from cvelistv5 – Published: 2026-09-10 15:48 – Updated: 2026-09-10 16:12

Title

rclone archive/zip: Zip Slip via unsanitized zip entry names lets a malicious archive escape its own namespace

Summary

rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.72.0 until 1.75.1, the archive ZIP backend method (*Fs).readZip in backend/archive/zip/zip.go accepts archive/zip.File.Name values from an untrusted central directory and exposes cleaned entry names without ensuring that they remain inside the archive namespace. Entries such as ../../etc/cron.d/evil can survive path.Clean and become Object.Remote() values that fs/sync and fs/operations use as destination-relative paths, allowing rclone copy or sync to write outside the selected destination on backends that do not independently confine the path. The non-empty root check also used strings.HasPrefix without a path boundary, so root foo could incorrectly include sibling foobar entries. This issue is fixed in version 1.75.1.

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 16:05 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/rclone/rclone/security/advisor…	x_refsource_CONFIRM
https://github.com/rclone/rclone/commit/5dae3adbf…	x_refsource_MISC
https://github.com/rclone/rclone/commit/6507e13d5…	x_refsource_MISC
https://github.com/rclone/rclone/releases/tag/v1.75.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
rclone	rclone	Affected: >= 1.72.0, < 1.75.1	guessed

Show details on NVD website

JSON

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              "content": {
                "id": "CVE-2026-88014",
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}

FKIE_CVE-2026-88014

Vulnerability from fkie_nvd - Published: 2026-09-10 16:18 - Updated: 2026-09-10 19:54

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/rclone/rclone/commit/5dae3adbf571a6cd9ba501eb47397a7e871e1ae0
	security-advisories@github.com	https://github.com/rclone/rclone/commit/6507e13d5a83789f500af96d7188c302c9d74d98
	security-advisories@github.com	https://github.com/rclone/rclone/releases/tag/v1.75.1
	security-advisories@github.com	https://github.com/rclone/rclone/security/advisories/GHSA-66hp-wgxq-6f5q
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/rclone/rclone/security/advisories/GHSA-66hp-wgxq-6f5q

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "rclone",
          "vendor": "rclone",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.72.0, \u003c 1.75.1"
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    {
      "lang": "en",
      "value": "rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.72.0 until 1.75.1, the archive ZIP backend method (*Fs).readZip in backend/archive/zip/zip.go accepts archive/zip.File.Name values from an untrusted central directory and exposes cleaned entry names without ensuring that they remain inside the archive namespace. Entries such as ../../etc/cron.d/evil can survive path.Clean and become Object.Remote() values that fs/sync and fs/operations use as destination-relative paths, allowing rclone copy or sync to write outside the selected destination on backends that do not independently confine the path. The non-empty root check also used strings.HasPrefix without a path boundary, so root foo could incorrectly include sibling foobar entries. This issue is fixed in version 1.75.1."
    }
  ],
  "id": "CVE-2026-88014",
  "lastModified": "2026-09-10T19:54:25.810",
  "metrics": {
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          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N",
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}

GHSA-66HP-WGXQ-6F5Q

Vulnerability from github – Published: 2026-09-10 23:03 – Updated: 2026-09-10 23:03

Summary

rclone archive/zip: Zip Slip via unsanitized zip entry names lets a malicious archive escape its own namespace

Details

Summary

backend/archive mounts a zip file as a browsable, syncable rclone Fs (e.g. rclone lsf :zip:downloaded.zip or rclone copy :zip:downloaded.zip dest:). Go's archive/zip package does not sanitize file.Name - it is taken verbatim from the untrusted zip's central directory. readZip() in backend/archive/zip/zip.go applies path.Clean to the entry name, but this alone cannot fully neutralize a name with more .. components than real segments preceding them (e.g. "../../etc/cron.d/evil" stays exactly as-is after cleaning). When the archive is mounted with an empty root (the common case), there was no check at all that the resulting name stayed inside the archive's own namespace, so it was stored verbatim and returned unchanged by Object.Remote().

fs/sync/fs/operations use srcObj.Remote() directly as the destination-relative path when copying between filesystems, so a maliciously crafted zip file can cause rclone copy/sync to attempt writes outside the intended destination directory on whatever backend it targets - this is the well-known "Zip Slip" vulnerability class (https://security.snyk.io/research/zip-slip-vulnerability) applied to rclone's own zip-mounting backend. It is distinct from cmd/archive/extract, which already validates via its own destPath() choke point and is not affected.

Details

Vulnerable code (before fix), backend/archive/zip/zip.go, (*Fs).readZip:

for _, file := range zr.File {
    remote := strings.Trim(path.Clean(file.Name), "/")
    if remote == "." { remote = "" }
    remote = path.Join(f.prefix, remote)
    if f.root != "" {
        // Ignore all files outside the root
        if !strings.HasPrefix(remote, f.root) { continue }
        ...
    }
    ...
    o := &Object{f: f, remote: remote, ...}
    dt.Add(o)
}

The escape check only ran when f.root != "", and even then used a bare strings.HasPrefix with no boundary check (so f.root="foo" incorrectly also matched a sibling entry "foobar").

PoC

Built a zip in memory with Go's real archive/zip writer (entry name "../../etc/cron.d/evil", not sanitized by the writer either), wrote it to disk, and mounted it via the actual production constructor zip.New(ctx, localFs, "evil.zip", "", ""):

zip entry Name="../../etc/cron.d/evil" -> Object.Remote()="../../etc/cron.d/evil"

Fully outside the archive's own namespace - confirmed via a regression test that mounts the malicious zip through the real local backend and inspects the resulting Fs's internal dirtree and every Object's Remote().

Impact

A user who runs rclone copy/sync/mount against an untrusted zip file (downloaded, e-mailed, etc.) can have files written outside the intended destination directory on the destination backend, depending on that backend's own confinement. No server compromise or custom remote configuration is required from the attacker - only a crafted zip file and a normal rclone copy/sync invocation by the victim.

Fix

Skip any zip entry whose cleaned+prefixed name still escapes the archive's own namespace, rather than exposing it. Also tightened the pre-existing root filter's weak prefix check.

Severity

6.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rclone/rclone"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.72.0"
            },
            {
              "fixed": "1.75.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-88014"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-10T23:03:16Z",
    "nvd_published_at": "2026-09-10T16:18:08Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n`backend/archive` mounts a zip file as a browsable, syncable rclone `Fs` (e.g. `rclone lsf :zip:downloaded.zip` or `rclone copy :zip:downloaded.zip dest:`). Go\u0027s `archive/zip` package does not sanitize `file.Name` - it is taken verbatim from the untrusted zip\u0027s central directory. `readZip()` in `backend/archive/zip/zip.go` applies `path.Clean` to the entry name, but this alone cannot fully neutralize a name with more `..` components than real segments preceding them (e.g. `\"../../etc/cron.d/evil\"` stays exactly as-is after cleaning). When the archive is mounted with an empty root (the common case), there was no check at all that the resulting name stayed inside the archive\u0027s own namespace, so it was stored verbatim and returned unchanged by `Object.Remote()`.\n\n`fs/sync`/`fs/operations` use `srcObj.Remote()` directly as the destination-relative path when copying between filesystems, so a maliciously crafted zip file can cause `rclone copy`/`sync` to attempt writes outside the intended destination directory on whatever backend it targets - this is the well-known \"Zip Slip\" vulnerability class (https://security.snyk.io/research/zip-slip-vulnerability) applied to rclone\u0027s own zip-mounting backend. It is distinct from `cmd/archive/extract`, which already validates via its own `destPath()` choke point and is not affected.\n\n### Details\nVulnerable code (before fix), `backend/archive/zip/zip.go`, `(*Fs).readZip`:\n```go\nfor _, file := range zr.File {\n\tremote := strings.Trim(path.Clean(file.Name), \"/\")\n\tif remote == \".\" { remote = \"\" }\n\tremote = path.Join(f.prefix, remote)\n\tif f.root != \"\" {\n\t\t// Ignore all files outside the root\n\t\tif !strings.HasPrefix(remote, f.root) { continue }\n\t\t...\n\t}\n\t...\n\to := \u0026Object{f: f, remote: remote, ...}\n\tdt.Add(o)\n}\n```\nThe escape check only ran when `f.root != \"\"`, and even then used a bare `strings.HasPrefix` with no boundary check (so `f.root=\"foo\"` incorrectly also matched a sibling entry `\"foobar\"`).\n\n### PoC\nBuilt a zip in memory with Go\u0027s real `archive/zip` writer (entry name `\"../../etc/cron.d/evil\"`, not sanitized by the writer either), wrote it to disk, and mounted it via the actual production constructor `zip.New(ctx, localFs, \"evil.zip\", \"\", \"\")`:\n```\nzip entry Name=\"../../etc/cron.d/evil\" -\u003e Object.Remote()=\"../../etc/cron.d/evil\"\n```\nFully outside the archive\u0027s own namespace - confirmed via a regression test that mounts the malicious zip through the real `local` backend and inspects the resulting Fs\u0027s internal dirtree and every Object\u0027s `Remote()`.\n\n### Impact\nA user who runs `rclone copy`/`sync`/`mount` against an untrusted zip file (downloaded, e-mailed, etc.) can have files written outside the intended destination directory on the destination backend, depending on that backend\u0027s own confinement. No server compromise or custom remote configuration is required from the attacker - only a crafted zip file and a normal `rclone copy`/`sync` invocation by the victim.\n\n### Fix\nSkip any zip entry whose cleaned+prefixed name still escapes the archive\u0027s own namespace, rather than exposing it. Also tightened the pre-existing root filter\u0027s weak prefix check.",
  "id": "GHSA-66hp-wgxq-6f5q",
  "modified": "2026-09-10T23:03:16Z",
  "published": "2026-09-10T23:03:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/security/advisories/GHSA-66hp-wgxq-6f5q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88014"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/commit/5dae3adbf571a6cd9ba501eb47397a7e871e1ae0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/commit/6507e13d5a83789f500af96d7188c302c9d74d98"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rclone/rclone"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/releases/tag/v1.75.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rclone archive/zip: Zip Slip via unsanitized zip entry names lets a malicious archive escape its own namespace"
}

ubuntu-cve-2026-88014

Vulnerability from osv_ubuntu

Published

2026-09-11 00:00

Modified

2026-09-14 08:43

Summary

Details

(rclone is a command-line program to sync files and directories to and ...)

Severity

6.3 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-88014	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-88014	REPORT
	https://github.com/rclone/rclone/security/advisor…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-ncw-rclone-dev",
            "binary_version": "1.36-3ubuntu0.2"
          },
          {
            "binary_name": "rclone",
            "binary_version": "1.36-3ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "rclone",
        "purl": "pkg:deb/ubuntu/rclone@1.36-3ubuntu0.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.36-3",
        "1.36-3ubuntu0.1",
        "1.36-3ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-rclone-rclone-dev",
            "binary_version": "1.50.2-2ubuntu0.2+esm1"
          },
          {
            "binary_name": "rclone",
            "binary_version": "1.50.2-2ubuntu0.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "rclone",
        "purl": "pkg:deb/ubuntu/rclone@1.50.2-2ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.47.0+ex1-6",
        "1.47.0+ex1-7",
        "1.49.5-2",
        "1.49.5-3",
        "1.50.2-2",
        "1.50.2-2ubuntu0.1",
        "1.50.2-2ubuntu0.2",
        "1.50.2-2ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-rclone-rclone-dev",
            "binary_version": "1.53.3-4ubuntu1.22.04.5+esm1"
          },
          {
            "binary_name": "rclone",
            "binary_version": "1.53.3-4ubuntu1.22.04.5+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "rclone",
        "purl": "pkg:deb/ubuntu/rclone@1.53.3-4ubuntu1.22.04.5+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.53.3-1",
        "1.53.3-2",
        "1.53.3-4",
        "1.53.3-4ubuntu1",
        "1.53.3-4ubuntu1.22.04.1",
        "1.53.3-4ubuntu1.22.04.2",
        "1.53.3-4ubuntu1.22.04.3",
        "1.53.3-4ubuntu1.22.04.3+esm1",
        "1.53.3-4ubuntu1.22.04.4",
        "1.53.3-4ubuntu1.22.04.4+esm1",
        "1.53.3-4ubuntu1.22.04.5",
        "1.53.3-4ubuntu1.22.04.5+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-rclone-rclone-dev",
            "binary_version": "1.60.1+dfsg-3ubuntu0.24.04.6+esm1"
          },
          {
            "binary_name": "rclone",
            "binary_version": "1.60.1+dfsg-3ubuntu0.24.04.6+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "rclone",
        "purl": "pkg:deb/ubuntu/rclone@1.60.1+dfsg-3ubuntu0.24.04.6+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.60.1+dfsg-2build1",
        "1.60.1+dfsg-3",
        "1.60.1+dfsg-3ubuntu0.24.04.1",
        "1.60.1+dfsg-3ubuntu0.24.04.2",
        "1.60.1+dfsg-3ubuntu0.24.04.3",
        "1.60.1+dfsg-3ubuntu0.24.04.4",
        "1.60.1+dfsg-3ubuntu0.24.04.4+esm1",
        "1.60.1+dfsg-3ubuntu0.24.04.5",
        "1.60.1+dfsg-3ubuntu0.24.04.5+esm1",
        "1.60.1+dfsg-3ubuntu0.24.04.6",
        "1.60.1+dfsg-3ubuntu0.24.04.6+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-rclone-rclone-dev",
            "binary_version": "1.60.1+dfsg-4ubuntu3.2+esm1"
          },
          {
            "binary_name": "rclone",
            "binary_version": "1.60.1+dfsg-4ubuntu3.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "rclone",
        "purl": "pkg:deb/ubuntu/rclone@1.60.1+dfsg-4ubuntu3.2+esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.60.1+dfsg-4ubuntu2",
        "1.60.1+dfsg-4ubuntu3",
        "1.60.1+dfsg-4ubuntu3.1",
        "1.60.1+dfsg-4ubuntu3.1+esm1",
        "1.60.1+dfsg-4ubuntu3.2",
        "1.60.1+dfsg-4ubuntu3.2+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "(rclone is a command-line program to sync files and directories to and ...)",
  "id": "UBUNTU-CVE-2026-88014",
  "modified": "2026-09-14T08:43:30Z",
  "published": "2026-09-11T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-88014"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-88014"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rclone/rclone/security/advisories/GHSA-66hp-wgxq-6f5q"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-88014"
  ]
}

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

CVE-2026-88014 (GCVE-0-2026-88014)

FKIE_CVE-2026-88014

GHSA-66HP-WGXQ-6F5Q

Summary

Details

PoC

Impact

Fix

ubuntu-cve-2026-88014

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour