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

What is CVE-2026-116188?

CVE-2026-116188 is a medium-severity vulnerability in rclone, published on 25 Oct 2026.

Official 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.

Weakness: CWE-190

Which versions are affected by CVE-2026-116188?

1 open source package ship an affected version, including rclone. It affects 1 product.

Products include Rclone Rclone.

How do I fix CVE-2026-116188?

Upgrade rclone to 1.75.2 or later.

Is CVE-2026-116188 being exploited?

There is no known exploitation of CVE-2026-116188 in the wild and no public exploit code.

Other vulnerabilities in rclone

• CVE-2026-88018 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass Critical 9.8
• CVE-2026-49980 Rclone: Unauthenticated command execution in `rclone rcd --rc-serve` via inline remote instantiation, bypassing CVE-2026-41179 fix Critical 9.8
• CVE-2026-41179 RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution Critical 9.2
• CVE-2026-41176 Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution Critical 9.2
• CVE-2026-59733 rclone `serve restic --private-repos` authorization bypass: `..` in the URL path lets an authenticated user read, overwrite and delete other users' repositories High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as BIT-rclone-2026-116188, DEBIAN-CVE-2026-116188, GHSA-6475-788v-w6c3, GHSA-qjw8-8hmp-c3m6, UBUNTU-CVE-2026-116188.