What’s Vulnerable › Vulnerabilities

CVE-2026-116188: rclone serve s3 1.75.0 before 1.75.2 Memory Limit Bypass via Multipart Overflow

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-25 · updated 2026-10-28
• Weakness: CWE-190

Description

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 products

• rclone: from 1.75.0 before 1.75.2 — fixed in 1.75.2
• rclone: from 1.75.0 before 1.75.2 — fixed in 1.75.2

How to fix

Upgrade to a fixed version: rclone 1.75.2; rclone 1.75.2. Check the vendor advisory for mitigations.

References

• https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6
• https://www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-bypass-via-multipart-overflow

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