CVE-2026-57565
Readest: Cross-tenant object write via unsanitized fileName in /api/storage/upload (object-key path traversal)
Readest is a modern, feature-rich ebook reader designed for seamless cross-platform access and an intuitive reading experience. Prior to 0.11.10, the apps/readest-app/src/pages/api/storage/upload.ts route constructed an object key from the authenticated user's identifier and a client-controlled fileName without rejecting path separators or parent-directory traversal. In the R2 backend, apps/readest-app/src/utils/r2.ts placed that key into a new Request URL before signing it, and URL normalization collapsed parent-directory components so the resulting presigned PUT could escape the caller's namespace. An authenticated attacker who knew a target user identifier and book hash could overwrite or poison that user's stored book object and corrupt the associated file_key metadata; the exact cross-tenant escape was verified for the R2 backend. This issue is fixed in version 0.11.10.
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 |
|---|---|---|
| readest readest |
< 0.11.10 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/readest/readest/security/advisories/GHSA-mfmj-2frf-vhgwCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/readest/readest/pull/4638CNA: GitHub_M · x_refsource_MISC
- https://github.com/readest/readest/commit/495783d04516d05b2eb10f8f8bad297d436b36deCNA: GitHub_M · x_refsource_MISC
- https://github.com/readest/readest/releases/tag/v0.11.10CNA: GitHub_M · x_refsource_MISC
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