Vulnerability in rclone

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund25 Oct 2026WID-SEC-2026-4156

  rclone: Multiple vulnerabilities Translated from German

  CVE-2026-116187CVE-2026-116191CVE-2026-116193+7 more CVEs

[ References ]References

• github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6Vendor Advisory
• www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-bypass-v…Third Party Advisory