Integer overflow in Rclone
CVE-2026-116188
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.
Vulnerability class: Integer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6 (vendor-advisory)
- www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116188?
- CVE-2026-116188 is a medium-severity vulnerability in Rclone, classified under Integer Overflow or Wraparound. CVSS score: 5.3/10. Published 2026-10-25.
- How severe is CVE-2026-116188?
- Medium severity. CVSS v3 base score is 5.3 out of 10.