CVE-2026-116188
rclone serve s3 1.75.0 before 1.75.2 Memory Limit Bypass via Multipart Overflow
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 and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| rclone rclone github.com/rclone/rclone
golang |
≥ 1.75.0; < 1.75.2 (affected, semver) 1.75.2 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
NVD applicability configurations (1)
These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.
[
{
"negate": false,
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.75.2",
"versionStartIncluding": "1.75.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
]CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.9 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CNA: VulnCheck |
| 4.0 / 6.9 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | NVD: [email protected] |
Exploit evidence
- https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6
exploit · ADP: CISA-ADP
References
- https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6CNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-bypass-via-multipart-overflowCNA: VulnCheck · third-party-advisory
- https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6ADP: CISA-ADP · exploit
- https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6[email protected] · Vendor Advisory
- https://www.vulncheck.com/advisories/rclone-serve-s3-1.75.0-before-1.75.2-memory-limit-bypass-via-multipart-overflow[email protected] · Third Party Advisory
- https://github.com/rclone/rclone/security/advisories/GHSA-qjw8-8hmp-c3m6134c704f-9b21-4f2e-91b3-4a467353bcc0 · Vendor Advisory
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