{"uuid": "6d46f657-479b-436e-a609-06f193140da1", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-67437", "type": "seen", "source": "https://gist.github.com/alon710/ebcd683ed5c708ce9306a8ed3912a91a", "content": "# CVE-2026-67437: CVE-2026-67437: Unauthenticated Denial of Service via OAuth2 State Memory Exhaustion in OliveTin\n\n> **CVSS Score:** 7.5\n> **Published:** 2026-07-30\n> **Full Report:** https://cvereports.com/reports/CVE-2026-67437\n\n## Summary\nAn uncontrolled resource consumption vulnerability (CWE-400) in OliveTin allows unauthenticated remote attackers to exhaust server memory and trigger a denial of service (DoS). By repeatedly initiating the OAuth2 login flow without completing it, attackers can force the server to allocate state variables in an unbounded in-memory map. This heap-based resource exhaustion eventually causes the host operating system to terminate the OliveTin process via the Out-Of-Memory (OOM) killer.\n\n## TL;DR\nUnauthenticated remote attackers can exhaust OliveTin server memory and crash the application by flooding the OAuth2 login endpoint, forcing unbounded allocation of state variables in memory.\n\n## Exploit Status: POC\n\n## Technical Details\n\n- **CWE ID**: CWE-400\n- **Attack Vector**: Network\n- **CVSS v3.1**: 7.5\n- **EPSS Score**: 0.00354\n- **Impact**: Denial of Service (DoS)\n- **Exploit Status**: PoC (Proof-of-Concept)\n- **KEV Status**: Not listed\n\n## Affected Systems\n\n- OliveTin\n- **OliveTin**: >= 3000.0.0, < 3000.17.0 (Fixed in: `3000.17.0`)\n\n## Mitigation\n\n- Upgrade to OliveTin 3000.17.0 or later\n- Implement rate-limiting on the /oauth/login route via a reverse proxy (e.g., Nginx)\n- Restrict access to the OliveTin interface using firewall rules or VPNs\n\n**Remediation Steps:**\n1. Identify running versions of OliveTin using asset management or container manifests.\n2. Deploy the 3000.17.0 update across affected environments.\n3. Configure reverse proxies to limit HTTP requests to /oauth/login to prevent resource exhaustion or service unavailability.\n\n## References\n\n- [GHSA-xpxj-f2fm-rqch: OliveTin OAuth2 state memory exhaustion advisory](https://github.com/OliveTin/OliveTin/security/advisories/GHSA-xpxj-f2fm-rqch)\n- [NVD Entry for CVE-2026-67437](https://nvd.nist.gov/vuln/detail/CVE-2026-67437)\n- [CVE.org Record for CVE-2026-67437](https://www.cve.org/CVERecord?id=CVE-2026-67437)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-67437) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-07-31T10:32:17.501159Z"}