CVE-2026-31817 OliveTin's unsafe parsing of UniqueTrackingId can be used to write files
Attackers can write arbitrary files via directory traversal in log filenames when saveLogs is enabled, requiring an upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31817?
CVE-2026-31817 is a high-severity path traversal vulnerability in OliveTin, published on 10 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OliveTin gives access to predefined shell commands from a web interface. Prior to 3000.11.2, when the saveLogs feature is enabled, OliveTin persists execution log entries to disk. The filename used for these log files is constructed in part from the user-supplied UniqueTrackingId field in the StartAction API request. This value is not validated or sanitized before being used in a file path, allowing an attacker to use directory traversal sequences (e.g., ../../../) to write files to arbitrary locations on the filesystem. This vulnerability is fixed in 3000.11.2.
Weakness: CWE-22
Which versions are affected by CVE-2026-31817?
3 open source packages ship an affected version, including github.com/OliveTin/OliveTin. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/OliveTin/OliveTin Go | All versions | 0.0.0-20260309102040-b03af0e2eca3 |
github.com/OliveTin/OliveTin Go | All versions | 0.0.0-20260309102040-b03af0e2eca3 |
github.com/OliveTin/OliveTin Go | All versions | 0.0.0-20260309102040-b03af0e2eca3 |
Products include Olivetin Olivetin.
How do I fix CVE-2026-31817?
Upgrade github.com/OliveTin/OliveTin to 0.0.0-20260309102040-b03af0e2eca3 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-31817 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31817 exists.
Other vulnerabilities in OliveTin
- CVE-2026-27626 OliveTin: OS Command Injection via `password` argument type and webhook JSON extraction bypasses shell safety checks
- CVE-2026-30223 OliveTin: JWT Audience Validation Bypass in Local Key and HMAC Modes
- CVE-2026-28342 OliveTin: Unauthenticated Denial of Service via Memory Exhaustion in PasswordHash API Endpoint
- CVE-2026-28789 OliveTin: Unauthenticated DoS via concurrent map writes in OAuth2 state handling
- CVE-2026-28790 OliveTin: Unauthenticated Action Termination via KillAction When Guests Must Login
Sources
Also known as GHSA-364q-w7vh-vhpc, GO-2026-4670.