CVE-2026-71310
rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory
Description
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.
INFO
Published Date :
Aug. 5, 2026, 9:16 p.m.
Last Modified :
Aug. 31, 2026, 3:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update rclone to version 1.75.0 or newer.
- Apply the latest security patches.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-71310.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-71310 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-71310
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-71310 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-71310 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
Aug. 31, 2026
Action Type Old Value New Value Added Reference https://github.com/rclone/rclone/commit/21d8cd3b92cd81d987f485051d454ea675d91a2b Added Reference https://github.com/rclone/rclone/releases/tag/v1.75.0 Added Reference https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr Added Reference https://pkg.go.dev/vuln/GO-2026-6199 Removed Reference https://github.com/rclone/rclone/commit/21d8cd3b92cd81d987f485051d454ea675d91a2b Removed Reference https://github.com/rclone/rclone/releases/tag/v1.75.0 Removed Reference https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 31, 2026
Action Type Old Value New Value Added Reference https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr Removed Reference https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 06, 2026
Action Type Old Value New Value Added Reference https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr Added SSVC {'id': 'CVE-2026-71310', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-06T13:47:26.826525Z'} -
New CVE Received by [email protected]
Aug. 05, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'rclone', 'product': 'rclone', 'versions': [{'status': 'affected', 'version': '< 1.75.0'}]}] Added Description 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added CWE CWE-770 Added Reference https://github.com/rclone/rclone/commit/21d8cd3b92cd81d987f485051d454ea675d91a2b Added Reference https://github.com/rclone/rclone/releases/tag/v1.75.0 Added Reference https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr