Quick answers
- Is CVE-2026-116188 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-116188 being exploited in the wild.
- How severe is CVE-2026-116188?
- Medium severity, with a CVSS score of 5.3, published 25 October 2026.
- Which products and versions are affected?
- Rclone 1.75.0 before 1.75.2.
- Is there a fix for CVE-2026-116188?
- Yes: fixed in 1.75.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-116188 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-116188?
- Check whether you run Rclone at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 1.75.2
Technical details
A signed int64 counter tracking buffered multipart upload data wraps to a large negative value when an unauthenticated client opens two concurrent current-part PUT requests each declaring 5 exabytes of data. The overflow defeats the reorder-memory capacity check, allowing subsequent out-of-order parts to bypass the configured buffer limit and be retained in memory. The attack is deterministic and requires the attacker to send actual bytes to exhaust memory, not merely crafted headers.
Affected products
- rclone rclone 1.75.0 before 1.75.2
Timeline
- 2026-10-09: disclosed
- 2026-10-25: advisory