CVE-2026-71310: medium-severity vulnerability in rclone
rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.9epss 0.6%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
rclone · rcloneRelated CVEs — rclone
In the same product, most dangerous first.
CVE-2026-41176CRITICALRclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command executionEPSS 32.7%CVE-2026-41179CRITICALRClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command executionEPSS 8.6%CVE-2026-49980CRITICALRclone: Unauthenticated command execution in `rclone rcd --rc-serve` via inline remote instantiation, bypassing CVE-2026-41179 fixEPSS 0.8%CVE-2026-88045HIGHrclone: S3 multipart declared-length memory exhaustionEPSS 0.6%CVE-2026-59733HIGHrclone `serve restic --private-repos` authorization bypass: `..` in the URL path lets an authenticated user read, overwrite and delete other users' repositoriesEPSS 0.6%CVE-2026-88018CRITICALrclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypassEPSS 0.5%