Vulnerability-Lookup

CVE-2026-71310 (GCVE-0-2026-71310)

Vulnerability from cvelistv5 – Published: 2026-08-05 20:17 – Updated: 2026-08-06 13:47

Title

rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory

Summary

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.0, the shared HTTP CONNECT helper in lib/proxy/http.go parses proxy CONNECT responses with http.ReadResponse over an unrestricted buffered reader, allowing a malicious or compromised configured proxy, or an active on-path actor controlling a plaintext HTTP proxy hop, to send oversized headers that grow memory until the rclone process fails. The affected helper is used by FTP and SFTP proxy connections, and SFTP reaches the parser before SSH server authentication, so target host key validation does not constrain a malicious proxy. This issue is fixed in 1.75.0.

Severity

5.9 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/rclone/rclone/security/advisor…	x_refsource_CONFIRM
https://github.com/rclone/rclone/commit/21d8cd3b9…	x_refsource_MISC
https://github.com/rclone/rclone/releases/tag/v1.75.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
rclone	rclone	Affected: < 1.75.0

Show details on NVD website

JSON

To clipboard

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GHSA-XHF4-832V-7XCR

Vulnerability from github – Published: 2026-08-05 20:17 – Updated: 2026-08-05 20:17

Summary

rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory

Details

1. Summary

The shared HTTP CONNECT helper parses a proxy response with http.ReadResponse over an unrestricted buffered reader. The production helper accepted a valid response containing a 2 MiB header in three consecutive runs. A malicious or compromised configured proxy, or an active on-path actor controlling a plaintext HTTP-proxy hop, can grow memory until the process fails.

The security impact is process-wide exhaustion, not loss of access through the malicious proxy, which the proxy already controls. The victim must configure and use the proxy, so UI is Required and the rating is Medium.

2. Affected Assets & Attack Surface

Verified rclone revision: a0c09f1381ae93e2a9a33c529d170186c61ad058 (v1.74.0-240-ga0c09f138)
Current-master check: lib/proxy/http.go was unchanged at master commit 961266888fe797390c535386f3b3aa46f4853602 on 2026-07-18
Shared helper: lib/proxy/http.go:23-81
SFTP use: backend/sftp/ssh_internal.go:25-45
FTP use: backend/ftp/ftp.go:465-479
Proxy peer: configured malicious/compromised proxy or active on-path actor for a plaintext HTTP proxy
TLS boundary: HTTPS proxy connections authenticate the proxy before this response is parsed, so an on-path actor must also defeat TLS

3. Technical Root Cause Analysis

HTTPConnectDial invokes http.ReadResponse(br, req) directly. This call does not inherit http.Transport.MaxResponseHeaderBytes. In the Go implementation used for validation, exported textproto.Reader.ReadMIMEHeader passes math.MaxInt64 limits, and textproto.NewReader explicitly instructs callers to use io.LimitReader or an equivalent bound for denial-of-service resistance. Rclone supplies no bound or total CONNECT-handshake deadline. The helper additionally returns the raw connection, so a safe remediation must preserve any tunnel bytes already buffered after the CONNECT response.

4. Proof-of-Concept & Evidence

Configure the helper to use a test proxy.
Accept rclone's CONNECT request.
Return HTTP/1.1 200 Connection Established with an X-Fill header containing 2 MiB of data.
The actual helper parses and accepts the entire response without a fixed ceiling; this succeeded in all three reruns.

The test establishes unbounded parsing behavior without intentionally exhausting the host.

5. Impact Assessment

Large or concurrent CONNECT responses can terminate the rclone process and interrupt unrelated FTP/SFTP remotes and mounts. Runtime OOM cannot be contained by RC panic recovery. SFTP reaches this parser before SSH server authentication, so target host-key validation does not constrain a malicious proxy; HTTPS proxy authentication does constrain ordinary on-path attackers.

6. Remediation Guidance

Enforce a total CONNECT status/header budget before parsing.
Add a fixed total handshake deadline as well as idle deadlines.
Close the connection on an oversized or malformed response.
Return a wrapper that consumes already buffered post-response tunnel bytes before the raw connection.
Test large single/multiple headers, slow streaming, and concurrent handshakes.

Severity

5.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.74.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rclone/rclone"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.75.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-71310"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-05T20:17:52Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## 1. Summary\n\nThe shared HTTP CONNECT helper parses a proxy response with `http.ReadResponse` over an unrestricted buffered reader. The production helper accepted a valid response containing a 2 MiB header in three consecutive runs. A malicious or compromised configured proxy, or an active on-path actor controlling a plaintext HTTP-proxy hop, can grow memory until the process fails.\n\nThe security impact is process-wide exhaustion, not loss of access through the malicious proxy, which the proxy already controls. The victim must configure and use the proxy, so UI is Required and the rating is Medium.\n\n## 2. Affected Assets \u0026 Attack Surface\n\n- Verified rclone revision: `a0c09f1381ae93e2a9a33c529d170186c61ad058` (`v1.74.0-240-ga0c09f138`)\n- Current-master check: `lib/proxy/http.go` was unchanged at master commit `961266888fe797390c535386f3b3aa46f4853602` on 2026-07-18\n- Shared helper: `lib/proxy/http.go:23-81`\n- SFTP use: `backend/sftp/ssh_internal.go:25-45`\n- FTP use: `backend/ftp/ftp.go:465-479`\n- Proxy peer: configured malicious/compromised proxy or active on-path actor for a plaintext HTTP proxy\n- TLS boundary: HTTPS proxy connections authenticate the proxy before this response is parsed, so an on-path actor must also defeat TLS\n\n## 3. Technical Root Cause Analysis\n\n`HTTPConnectDial` invokes `http.ReadResponse(br, req)` directly. This call does not inherit `http.Transport.MaxResponseHeaderBytes`. In the Go implementation used for validation, exported `textproto.Reader.ReadMIMEHeader` passes `math.MaxInt64` limits, and `textproto.NewReader` explicitly instructs callers to use `io.LimitReader` or an equivalent bound for denial-of-service resistance. Rclone supplies no bound or total CONNECT-handshake deadline. The helper additionally returns the raw connection, so a safe remediation must preserve any tunnel bytes already buffered after the CONNECT response.\n\n## 4. Proof-of-Concept \u0026 Evidence\n\n1. Configure the helper to use a test proxy.\n2. Accept rclone\u0027s CONNECT request.\n3. Return `HTTP/1.1 200 Connection Established` with an `X-Fill` header containing 2 MiB of data.\n4. The actual helper parses and accepts the entire response without a fixed ceiling; this succeeded in all three reruns.\n\nThe test establishes unbounded parsing behavior without intentionally exhausting the host.\n\n## 5. Impact Assessment\n\nLarge or concurrent CONNECT responses can terminate the rclone process and interrupt unrelated FTP/SFTP remotes and mounts. Runtime OOM cannot be contained by RC panic recovery. SFTP reaches this parser before SSH server authentication, so target host-key validation does not constrain a malicious proxy; HTTPS proxy authentication does constrain ordinary on-path attackers.\n\n## 6. Remediation Guidance\n\n- Enforce a total CONNECT status/header budget before parsing.\n- Add a fixed total handshake deadline as well as idle deadlines.\n- Close the connection on an oversized or malformed response.\n- Return a wrapper that consumes already buffered post-response tunnel bytes before the raw connection.\n- Test large single/multiple headers, slow streaming, and concurrent handshakes.",
  "id": "GHSA-xhf4-832v-7xcr",
  "modified": "2026-08-05T20:17:52Z",
  "published": "2026-08-05T20:17:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/commit/21d8cd3b92cd81d987f485051d454ea675d91a2b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rclone/rclone"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/releases/tag/v1.75.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory"
}

ubuntu-cve-2026-71310

Vulnerability from osv_ubuntu

Published

2026-08-06 00:00

Modified

2026-08-06 00:00

Summary

Details

Severity

5.9 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-71310	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-71310	REPORT
	https://github.com/rclone/rclone/security/advisor…	REPORT
	https://github.com/rclone/rclone/commit/21d8cd3b9…	REPORT
	https://github.com/rclone/rclone/releases/tag/v1.75.0	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",
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      },
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        "1.36-3ubuntu0.1",
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    {
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        "binaries": [
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            "binary_version": "1.50.2-2ubuntu0.2+esm1"
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      "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"
      },
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        }
      ],
      "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 from different cloud storage providers. Prior to 1.75.0, the shared HTTP CONNECT helper in lib/proxy/http.go parses proxy CONNECT responses with http.ReadResponse over an unrestricted buffered reader, allowing a malicious or compromised configured proxy, or an active on-path actor controlling a plaintext HTTP proxy hop, to send oversized headers that grow memory until the rclone process fails. The affected helper is used by FTP and SFTP proxy connections, and SFTP reaches the parser before SSH server authentication, so target host key validation does not constrain a malicious proxy. This issue is fixed in 1.75.0.",
  "id": "UBUNTU-CVE-2026-71310",
  "modified": "2026-08-06T00:00:00Z",
  "published": "2026-08-06T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-71310"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-71310"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rclone/rclone/commit/21d8cd3b92cd81d987f485051d454ea675d91a2b"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rclone/rclone/releases/tag/v1.75.0"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-71310"
  ]
}

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.

Action not permitted

CVE-2026-71310 (GCVE-0-2026-71310)

GHSA-XHF4-832V-7XCR

1. Summary

2. Affected Assets & Attack Surface

3. Technical Root Cause Analysis

4. Proof-of-Concept & Evidence

5. Impact Assessment

6. Remediation Guidance

ubuntu-cve-2026-71310

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature