CVE-2026-10546 DNS Rebinding TOCTOU Bypass of SSRF Protection in Langflow OSS URL Component

What is CVE-2026-10546?

CVE-2026-10546 is a high-severity server-side request forgery vulnerability in Langflow Langflow, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

IBM Langflow OSS 1.0.0 through 1.9.3 contains a Server-Side Request Forgery (SSRF) vulnerability in the URL component ( src/lfx/src/lfx/components/data_source/url.py ) due to a Time-of-Check/Time-of-Use (TOCTOU) race condition that can be exploited via DNS rebinding.

Weakness: CWE-918

Which versions are affected by CVE-2026-10546?

It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2026-10546?

No fix has been published for CVE-2026-10546 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-10546 being exploited?

There is no known exploitation of CVE-2026-10546 in the wild and no public exploit code.

Other vulnerabilities in Langflow Langflow

• CVE-2026-9198 IBM Langflow Code Injection Exploited Critical 9.8
• CVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Exploited Critical 9.8
• CVE-2025-3248 Langflow Missing Authentication Exploited Critical 9.8
• CVE-2025-34291 Langflow Origin Validation Error Exploited Critical 9.4
• CVE-2026-33017 Langflow Code Injection Exploited Critical 9.3

All Langflow Langflow vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-phxc-h9ch-q3gg.