CVE-2026-42073: OpenClaude is an open-source coding-agent command line interface for cloud and local model providers

Q: How do I fix CVE-2026-42073?

openclaude: upgrade to 0.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-42073 being exploited?

CVE-2026-42073 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42073 affect?

CVE-2026-42073 affects openclaude. Severity is medium (CVSS 6.5). 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

Q: How urgent is CVE-2026-42073?

Priority 32/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-42073 is a medium-severity flaw (CVSS 6.5) affecting openclaude. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ser

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-352, CWE-400
Published	2026-06-02
Last modified	2026-07-22

Publisher (CNA): GitHub, Inc. · Vendor: gitlawb

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-02 17:16 UTCPublished CVE record published
2026-07-22 19:10 UTCUpdated Record last modified

gitlawb openclaude UPGRADE

Affected: < 0.5.1

Fixed in: 0.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openclaude || rpm -q openclaude || openclaude --version

2. UPGRADE to 0.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openclaude

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openclaude

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42073?

openclaude: upgrade to 0.5.1. Exact commands for each OS are on this page.

Is CVE-2026-42073 being exploited?

CVE-2026-42073 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42073 affect?

CVE-2026-42073 affects openclaude. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-42073?

Priority 32/100. Public exploit reference

Related CVEs

CVE-2026-35570 HIGH 8.4 UPGRADE OpenClaude is an open-source coding-agent command line interface for cloud and local model providers
CVE-2026-42074 CRITICAL 9.8 UPGRADE OpenClaude is an open-source coding-agent command line interface for cloud and local model providers

References

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