rclone: S3 multipart declared-length memory exhaustion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-88045
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-10 17:17:08 UTC
Updated2026-09-10 18:18:13 UTC
Descriptionrclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.75.0 until 1.75.1, the serve S3 streamed multipart path in cmd/serve/s3/multipart.go passes attacker-controlled contentLength to multipart.NewRW().Reserve before reading request-body bytes. waitForTurn admits the current part and one oversized part when the buffer is empty despite --multipart-streaming-buffer-limit, and lib/pool allocates 1 MiB pages according to Content-Length or X-Amz-Decoded-Content-Length. A network client can retain or multiply these reservations without sending the declared body, exhausting process or host memory or permanently blocking request handlers. Anonymous S3 deployments require no credentials, while deployments using auth_key require an accepted S3 key. This issue is fixed in version 1.75.1.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-789 | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rclone Rclone affected >= 1.75.0, < 1.75.1 Not specified

References

ReferenceSourceLinkTags
github.com/rclone/rclone/issues/9616 [email protected] github.com
github.com/rclone/rclone/commit/ab1f458013aaf6356e4bdeca61f7cb9139f8eb86 [email protected] github.com
github.com/rclone/rclone/releases/tag/v1.75.1 [email protected] github.com
github.com/rclone/rclone/commit/7c1dfd99f3e6a22fcefd8686cc478226a15e63a1 [email protected] github.com
github.com/rclone/rclone/security/advisories/GHSA-2p48-j3qc-rx9f 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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