TI-2026-49968 Aliases CVE-2026-71310 GHSA-xhf4-832v-7xcr

rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory

MEDIUM 60CWE-400Published 2026-08-05 · Updated 2026-08-31

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00611 49th percentileScored 2026-11-07

Fix Partial rclone (rclone): 1.75.0github.com/rclone/rclone (Go): 1.75.0Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
rclone	rclone	before 1.75.0	1.75.0	Patch available	CNA
—	github.com/rclone/rclone (Go)	before 1.75.0	1.75.0	Patch available	GHSA-xhf4-832v-7xcr

rclone Vendorrclone Affected before 1.75.0 Fixed in 1.75.0 Patch available CNA
github.com/rclone/rclone (Go) Vendor— Affected before 1.75.0 Fixed in 1.75.0 Patch available GHSA-xhf4-832v-7xcr

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:rclone:rclone::::::::	—	—	rclone

cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:* Versions — — ·rclone

Remediation

Fix · CNA rclone (rclone) Fixed in 1.75.0
Fix · GHSA-xhf4-832v-7xcr github.com/rclone/rclone (Go) Fixed in 1.75.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Advanced Cluster Management for Kubernetes 2	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-71310
2026-10-03 Alias added: GHSA-xhf4-832v-7xcr

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-71310

Other 5

TI-2026-60044 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass CVSS 3.1CRITICAL 9.8
TI-2026-29802 RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution CVSS 4.0CRITICAL 9.2
TI-2026-29799 Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution CVSS 4.0CRITICAL 9.2
TI-2026-60064 rclone: RC per-server auth-proxy bypass CVSS 3.1CRITICAL 9.1
TI-2026-42602 Path traversal in rclone CVSS 3.1HIGH 8.8
TI-2026-60065 rclone: S3 multipart declared-length memory exhaustion CVSS 3.1HIGH 7.5

See all 43 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences