Medium severity · published Oct 25, 2026
CVE-2026-116188
rclone serve s3 1.75.0 before 1.75.2 Memory Limit Bypass via Multipart Overflow
New
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RC
rclone · rclone
1.75.0 before 1.75.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116188
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116188
github.com
https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6
www.vulncheck.com
https://www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-bypass-via-multipart-overflow
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