CVE-2026-77633— Cloudreve: Storage-quota TOCTOU race allows quota bypass and storage-based denial of service
一分钟漏洞结论
影响对象
cloudreve cloudreve
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Cloudreve is a self-hosted file management and sharing system. Prior to 4.18.0, PrepareUpload in pkg/filemanager/fs/dbfs/upload.go checks a stale in-memory user storage value through validateUserCapacity and later applies an unconditional storage charge outsid
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一、 漏洞 CVE-2026-77633 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
Cloudreve: Storage-quota TOCTOU race allows quota bypass and storage-based denial of service
来源: CVE Program / CVE List V5
Vulnerability Description
Cloudreve is a self-hosted file management and sharing system. Prior to 4.18.0, PrepareUpload in pkg/filemanager/fs/dbfs/upload.go checks a stale in-memory user storage value through validateUserCapacity and later applies an unconditional storage charge outside the same quota-enforcing transaction. An authenticated user with Files.Write permission can issue concurrent upload-session requests that read the same capacity snapshot, all pass the MaxStorage check, and reserve their declared sizes through CommitWithStorageDiff. The resulting reservations can exceed the account quota and can be materialized as chunked uploads that exhaust host storage and deny uploads to other users. The default local-storage policy and default User group are affected. This issue is fixed in version 4.18.0.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-77633 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-77633 补丁与修复 (1)
CVE-2026-77633 其他参考 (2)
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Release 4.18.0 · cloudreve/cloudreve · GitHub x_refsource_MISC
同批安全公告 · cloudreve · 2026-09-22 · 共 3 条
| CVE-2026-79913 | 6.5 MEDIUM | Cloudreve: SSRF guard bypass: checkIP does not decode IPv6-transition wrappers (NAT64, IPv |
| CVE-2026-77637 | 3.8 LOW | Cloudreve: Privilege Scope Bypass: State-Mutating Admin Operations Accessible via Read-Onl |
IV. Related Vulnerabilities
V. Comments for CVE-2026-77633
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