CVE-2026-0770: Critical Remote Code Execution Vulnerability in Langflow, Actively Exploited

CVE-2026-0770: Critical Remote Code Execution Vulnerability in Langflow, Actively Exploited

In short

CVE-2026-0770 is a critical vulnerability, with a CVSS score of 9.8, affecting Langflow [1]. It allows a remote attacker, without needing to authenticate, to execute arbitrary code on the affected server, potentially with root privileges [1]. The CVE is included in CISA's Known Exploited Vulnerabilities catalog (KEV) [2], confirming that it is being actively exploited. If your company uses Langflow to build or manage artificial intelligence workflows, today's priority is to update the product and restrict network access to any instance that isn't already restricted.

What it is and why it matters

Langflow is a tool used to design and run AI workflows. According to the official vulnerability record, the flaw lies in the way the "validate" endpoint handles the "exec_globals" parameter: the system includes and executes a resource originating from an untrusted control sphere, allowing an attacker to make the server execute arbitrary code in the context of root, with no prior credentials required [1]. The vulnerability was published on January 23, 2026, and is rated critical according to NVD [1]. It is also listed in the CISA KEV catalog of known exploited vulnerabilities [2], which in practice means this is not a theoretical risk: active exploitation has already been documented by an official source.

On OCIRIA's intelligence radar, we have classified this CVE under the category "vulnerability in AI tools," precisely because the impact isn't limited to just any server, but to the infrastructure that many companies are beginning to use to automate processes with language models. When this type of infrastructure is compromised, the attacker doesn't just gain access to the server: they can reach the workflows, credentials, and data that those workflows handle.

Who is affected

The affected vendor is Langflow [1]. The public record does not detail specific ranges of patched or unpatched versions, so we cannot state precisely "up to which version" a deployment is vulnerable; the prudent approach is to treat any Langflow installation that hasn't been recently updated as potentially exposed until confirmed otherwise with the vendor. Organizations that expose their Langflow instance to the internet or to poorly segmented networks are especially at risk, since exploitation does not require authentication [1].

How to know if you're vulnerable

Since there is no verified version range in the official source, the first step is to check directly with the vendor or in Langflow's changelog whether the version installed in your organization includes the fix for this vulnerability. In parallel, you should check whether the "validate" endpoint of your instance is accessible from outside your corporate network: if it is, the risk level is higher, given that exploitation does not require credentials [1]. It is also advisable to more broadly review what surface of your company is exposed to the internet, since AI services like Langflow are often deployed quickly and end up visible without the security team having full control over it.

How to protect yourself

• Update Langflow to the latest version available from the vendor as soon as possible; since the CVE is in the KEV catalog [2], active exploitation makes waiting riskier than usual.
• If you cannot update immediately, restrict network access to the instance: it should only be accessible from internal networks or via VPN, never open to the internet.
• Review access logs for the "validate" endpoint for anomalous or unauthenticated requests, especially if the instance has been exposed.
• Isolate instances you cannot patch immediately, separating them from the rest of the corporate network while the update is completed.
• Document which systems and data your Langflow workflow handles, so you can assess the real impact if a compromise is confirmed.

FAQ

Do I need to be authenticated for this vulnerability to be exploited against me?

No. According to the official description, a remote attacker can exploit it without prior authentication [1].

Is it confirmed that it is being actively exploited?

Yes, the CVE appears in CISA's Known Exploited Vulnerabilities catalog (KEV) [2], indicating documented active exploitation.

How severe is it compared to other vulnerabilities?

It has a CVSS score of 9.8 out of 10 and is rated critical by NVD [1], one of the highest possible levels.

Does it only affect large companies with dedicated AI teams?

Not necessarily. Any organization that has deployed Langflow, even in tests or internal projects, may be exposed if the instance is accessible from outside.

Sources

• [1] https://nvd.nist.gov/vuln/detail/CVE-2026-0770
• [2] https://raw.githubusercontent.com/cisagov/kev-data/develop/known_exploited_vulnerabilities.json