---
id: CVE-2026-116188
title: >-
  rclone serve s3 1.75.0 before 1.75.2 Memory Limit Bypass via Multipart
  Overflow
summary: >-
  rclone serve s3 versions 1.75.0 before 1.75.2 contain an integer overflow
  vulnerability in multipart reorder-memory accounting that bypasses the
  configured buffer limit. Attackers can open two concurrent current-part PUT
  requests declari…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-190
vendor: rclone
product: rclone
affected:
  - rclone >= 1.75.0 < 1.75.2
published: '2026-10-25'
updated: '2026-10-25'
sourceUpdated: '2026-10-25T13:20:24.506Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116188'
references:
  - url: 'https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6'
    label: GitHub Security Advisory (GHSA-qjw8-8hmp-c3m6)
  - url: >-
      https://www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-bypass-via-multipart-overflow
    label: >-
      VulnCheck Advisory: rclone serve s3 1.75.0 before 1.75.2 Memory Limit
      Bypass via Multipart Overflow
tags:
  - cve.org
ingestedAt: '2026-10-25T22:08:29.943Z'
---

## Overview

rclone serve s3 versions 1.75.0 before 1.75.2 contain an integer overflow vulnerability in multipart reorder-memory accounting that bypasses the configured buffer limit. Attackers can open two concurrent current-part PUT requests declaring huge lengths to wrap the signed int64 counter and retain out-of-order parts in memory, exhausting the host.

## Affected

- `rclone >= 1.75.0 < 1.75.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.