High severity · published Sep 30, 2026
CVE-2026-103398
OpenSave through 2.4.0 Arbitrary File Read and Write via Peer-Controlled Save Path
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
OpenSave through 2.4.0 fails to properly validate save paths supplied by paired peers in the manifest request handler. Attackers can specify arbitrary directories outside configured save locations to read and write files through manifest and sync routes.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
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
OP
OpenSave · Liquid-co
through 2.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103398
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103398
third-party-advisory
https://gist.github.com/mansurmavlankulov/2ca66f95965fb9d4aab353bcf2434cdb
technical-description
https://github.com/Liquid-co/OpenSave/blob/v2.4.0/internal/p2p/routes.go#L555-L566
technical-description
https://github.com/Liquid-co/OpenSave/blob/v2.4.0/internal/delta/rootguard.go#L16-L30
product
https://github.com/Liquid-co/OpenSave
third-party-advisory
https://www.vulncheck.com/advisories/opensave-through-2.4.0-arbitrary-file-read-and-write-via-peer-controlled-save-path
More from OpenSave
5.6
CVE-2026-103397
OpenSave before 2.4.0-beta.1 Authentication Bypass via Spoofed Relay Sender