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Public proof of conceptFix available

CVE-2026-71310

A public proof of concept exists; no exploitation attested.

  • Published2026-08-05
  • Fixed in1.75.0
  • WeaknessCWE-400 · CWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-08-0521:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-71310?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-71310?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV
rclone
BranchAffectedFixed in
1.75< 1.75.01.75.0
rclone/rclone
BranchAffectedFixed in
1.75< 1.75.01.75.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-71310 Red Hat Product Security1 known affected

    github.com/rclone/rclone: rclone: Denial of Service via unbounded HTTP CONNECT response headers

    rhacm2/volsync-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2

Full record on NVD

Fix

  1. Update rclone to 1.75.0
  2. Workaround from the vendor Red Hat Product Security CVE-2026-71310 · 1 productAvoid routing rclone FTP or SFTP connections through untrusted HTTP proxies. If a proxy is required, ensure it is a trusted, internally controlled endpoint. No mitigation is needed for deployments that do not use HTTP proxies for rclone connections.
  3. No fix available, says the vendor Red Hat Product Security CVE-2026-71310 · 1 productFix deferred

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-08-06
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.15.9read 2026-10-23
  • CNAweakness (CWE)CWE-400, CWE-770read 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-08-05
Last Modified
2026-09-09
NVD status
Awaiting Analysis

Frequently asked questions

What is CVE-2026-71310?

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.

Is CVE-2026-71310 actively exploited?

A proof-of-concept exploit exists for CVE-2026-71310, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-71310?

CVE-2026-71310 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

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