CVE-2026-28789 OliveTin: Unauthenticated DoS via concurrent map writes in OAuth2 state handling
Unauthenticated attackers can crash OliveTin by triggering a race condition in OAuth2 state handling, requiring OAuth2 to be enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-28789?
CVE-2026-28789 is a high-severity vulnerability in OliveTin, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OliveTin gives access to predefined shell commands from a web interface. Prior to version 3000.10.3, an unauthenticated denial-of-service vulnerability exists in OliveTin’s OAuth2 login flow. Concurrent requests to /oauth/login can trigger unsynchronized access to a shared registeredStates map, causing a Go runtime panic (fatal error: concurrent map writes) and process termination. This allows remote attackers to crash the service when OAuth2 is enabled. This issue has been patched in version 3000.10.3.
Which versions are affected by CVE-2026-28789?
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 | None |
github.com/OliveTin/OliveTin Go | All versions | 0.0.0-20260301235225-f044d90d5525c |
github.com/OliveTin/OliveTin Go | All versions | 0.0.0-20260301235225-f044d90d5525c |
Products include Olivetin Olivetin.
How do I fix CVE-2026-28789?
Upgrade github.com/OliveTin/OliveTin to 0.0.0-20260301235225-f044d90d5525c or later.
Is CVE-2026-28789 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28789 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-2026-31817 OliveTin's unsafe parsing of UniqueTrackingId can be used to write files
- CVE-2026-28342 OliveTin: Unauthenticated Denial of Service via Memory Exhaustion in PasswordHash API Endpoint
- CVE-2026-28790 OliveTin: Unauthenticated Action Termination via KillAction When Guests Must Login
Sources
Also known as GHSA-45m3-398w-m2m9, GO-2026-4586.