CVE-2026-7873: Code Injection Vulnerability in Code Validation Endpoint

Synopsis

This is a code injection vulnerability in IBM Langflow OSS, versions 1.0.0 through 1.10.0, affecting the code validation endpoint. An attacker with any valid account can reach the vulnerable endpoint over the network and inject arbitrary OS commands without needing elevated privileges or any victim interaction. Successful exploitation gives the attacker full control of the underlying system, including the ability to read credentials, execute arbitrary commands, and move laterally to connected systems. No upstream fix has been published yet; HarborGuard is tracking the advisory and will make a patched-image rebuild available the moment IBM releases one.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The vulnerable endpoint is exposed over the network, so an attacker must be able to reach the service remotely.

• AuthenticationRequired

  Any low-privilege authenticated account is sufficient to reach the vulnerable code validation endpoint; no administrative rights are needed.

• Victim interactionNot required

  No victim action is needed; the attacker sends a crafted request directly to the endpoint without requiring anyone to click a link or open a file.

• Attack complexityDetail

  Attack complexity is low, meaning the exploit is reliable and requires no special environmental conditions, race conditions, or memory-layout knowledge.

Blast Radius

• Reads sensitive files on the host, including stored credentials, API keys, and configuration secrets that may be used to access downstream systems.
• Executes arbitrary OS commands on the underlying host with the permissions of the Langflow process.
• Achieves full confidentiality, integrity, and availability impact on the compromised host, effectively constituting a complete system takeover.
• Enables lateral movement to adjacent systems or cloud environments using harvested credentials, extending the breach beyond the initial host.