Vulnerability · Published Oct 25, 2026 · Assigned by VulnCheck

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

Medium 5.3

In plain English

A medium-severity integer overflow in rclone from rclone. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 83.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.24	rclone	1.75.2-r0	ALPINE-CVE-2026-116188
Debian:12	rclone	no fix listed	DEBIAN-CVE-2026-116188
Debian:13	rclone	no fix listed	DEBIAN-CVE-2026-116188
Ubuntu:26.10	rclone	no fix listed	UBUNTU-CVE-2026-116188

Affected products (as reported)

Vendor	Product	Versions
rclone	rclone	1.75.0 – before 1.75.2

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-qjw8-8hmp-c3m6) vendor-advisory
VulnCheck Advisory: rclone serve s3 1.75.0 before 1.75.2 Memory Limit Bypass via Multipart Overflow third-party-advisory