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CVE-2026-88045— rclone: S3 multipart declared-length memory exhaustion

Quick assessment

Affected
rclone rclone
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rclone 是一款命令行工具，用于在不同云存储提供商之间同步文件和目录。在版本 1.75.0 到 1.75.1 之间， 中的 S3 流式分块上传（multipart）路径存在缺陷：在处理请求之前，将攻击者可控的 传递给了 。当缓冲区为空时， 会同时接受当前分块和一个超大分块，这违背了 的限制；此外， 会根据 或 分配 1 MiB 的内存页。攻击者可以通过网络发送请求头但不实际发送相应的请求体，从而保留甚至放大这些内存预留，进而耗尽进程或主机的内存，或导致请求处理程序永久阻塞。对于使用 的部署，攻击者需要拥有一个有

CVSS 7.5 · High
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I. Basic Information for CVE-2026-88045

Vulnerability Information
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Vulnerability Title
rclone: S3 multipart declared-length memory exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
rclone 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rclone rclone >= 1.75.0, < 1.75.1 -

II. Public POCs for CVE-2026-88045

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III. Intelligence Information for CVE-2026-88045

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Other References for CVE-2026-88045 (4)

Same Patch Batch · rclone · 2026-09-10 · 9 CVEs total

CVE-2026-88018 9.8 CRITICAL rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signatu
CVE-2026-88044 9.1 CRITICAL rclone: RC per-server auth-proxy bypass
CVE-2026-88017 7.3 HIGH rclone: FTP cross-session auth-proxy backend confusion
CVE-2026-88016 7.1 HIGH rclone: Directory metadata (chmod/chown/chtimes) applied through a planted symlink in rclo
CVE-2026-88014 6.3 MEDIUM rclone archive/zip: Zip Slip via unsanitized zip entry names lets a malicious archive esca
CVE-2026-88015 5.3 MEDIUM rclone local: crafted Range request against a translated symlink panics (DoS)
CVE-2026-88046 5.3 MEDIUM rclone: source object names can escape the configured root on upload
CVE-2026-88013 3.7 LOW rclone: http backend forwards custom/auth headers to a different host on redirect

IV. Related Vulnerabilities

Same product: rclone
Same vendor: rclone
Same weakness: CWE-789

V. Comments for CVE-2026-88045

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