CVE-2026-42073

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Source
https://cve.org/CVERecord?id=CVE-2026-42073
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42073.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42073
Aliases
Published
2026-06-02T15:38:53.435Z
Modified
2026-07-08T08:13:18.670380990Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
OpenClaude's MCP OAuth Callback: State Check Bypass via error Param Leads to DoS
Details

OpenClaude is an open-source coding-agent command line interface for cloud and local model providers. Prior to version 0.5.1, the OpenClaude MCP authentication flow starts a temporary local HTTP server to handle OAuth callbacks. To prevent CSRF attacks, the server validates a state parameter against an internally stored value. However, due to a logic flaw in the order of conditionals, an attacker can completely bypass this check and force the server to shut down — without knowing the state value at all. This issue has been patched in version 0.5.1.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42073.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-352",
        "CWE-400"
    ]
}
References

Affected packages

Git / github.com/gitlawb/openclaude

Affected ranges

Type
GIT
Repo
https://github.com/gitlawb/openclaude
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c0b8a59a2377ebf49389d3e6adf41e6d255cb975
Fixed
739b8d1f40fde0e401a5cbd2b9a55d88bd5124ad
Database specific 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:gitlawb:openclaude:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.5.1"
        }
    ]
}

Affected versions

v0.*
v0.1.6
v0.1.7
v0.1.8
v0.2.0
v0.2.1
v0.2.2
v0.2.3
v0.3.0
v0.4.0
v0.5.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42073.json"