vulnerability / NVI-00014995 / Revision 1
OliveTin: Unauthenticated DoS via OAuth2 State Memory Exhaustion (Unbounded Map Growth)
GitHub lists this reviewed advisory for github.com/OliveTin/OliveTin. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.5 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
github.com/OliveTin/OliveTin
source listed>= 0.0.0-20251024001301-45f9c18bc3ee, < 0.0.0-20260708075951-ec114e95d297
## Summary OliveTin's OAuth2 login handler stores per-login state in an in-memory map (`registeredStates`) that grows unboundedly. States are added on every `/oauth/login` request but are **never deleted or expired**. An unauthenticated attacker can send millions of requests to `/oauth/login` to fill the map with state entries, exhausting server memory and causing a denial of service. This is **distinct from CVE-2026-28789** (concurrent map writes crash). That CVE was about the panic from unsynchronized map access — the fix added a `sync.RWMutex`. This vulnerability is about the **unbounded growth** of the map even WITH the mutex, as no cleanup mechanism exists. ## Affected Versions - All versions with OAuth2 support, including >= 3000.10.3 (which patched CVE-2026-28789) ## Details In `service/internal/auth/otoauth2/restapi_auth_oauth2.go`: ```go type OAuth2Handler struct { cfg *config.Config mu sync.RWMutex registeredStates map[string]*oauth2State // NEVER cleaned up registeredProviders map[string]*oauth2.Config } ``` The `HandleOAuthLogin` handler adds a new state on every request: ```go func (h *OAuth2Handler) HandleO
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-xpxj-f2fm-rqch ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.