CVE-2026-67437 OliveTin: Unauthenticated DoS via OAuth2 State Memory Exhaustion (Unbounded Map Growth)
Unauthenticated attackers can exhaust server memory by repeatedly triggering OAuth2 login requests, causing a denial of service in OliveTin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67437?
CVE-2026-67437 is a high-severity denial of service vulnerability in OliveTin, published on 29 Jul 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. From 3000.0.0 until 3000.17.0, the service/internal/auth/otoauth2/restapi_auth_oauth2.go OAuth2 login handler stores per-login state in the registeredStates map on every /oauth/login request without expiring, deleting, or bounding entries, allowing an unauthenticated attacker to exhaust memory and cause a denial of service. This issue is fixed in version 3000.17.0.
Which versions are affected by CVE-2026-67437?
3 open source packages ship an affected version, including github.com/OliveTin/OliveTin.
| Package | Affected | Fixed in |
|---|---|---|
github.com/OliveTin/OliveTin Go | From 0.0.0-20251024001301-45f9c18bc3ee | 0.0.0-20260708075951-ec114e95d297 |
github.com/OliveTin/OliveTin Go | From 0.0.0-20251024001301-45f9c18bc3ee | 0.0.0-20260708075951-ec114e95d297 |
github.com/OliveTin/OliveTin Go | From 0.0.0-20251024001301-45f9c18bc3ee | 0.0.0-20260708075951-ec114e95d297 |
How do I fix CVE-2026-67437?
Upgrade github.com/OliveTin/OliveTin to 0.0.0-20260708075951-ec114e95d297 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-67437 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67437 exists.
Sources
Also known as GHSA-xpxj-f2fm-rqch, GO-2026-6146.