CVE-2026-76059 IBM CVE debrief

Who should care

Defenders responsible for IBM Langflow OSS deployments, particularly those allowing custom component source code submissions, should assess exposure and prioritize verification and remediation efforts.

Why it matters

CVE-2026-76059 allows an attacker to bypass the static security scanner in IBM Langflow OSS, potentially leading to arbitrary operating system command execution. Defenders should prioritize verifying vulnerable versions, assessing exposure to custom component submissions, and implementing compensating controls.

• Potential for arbitrary operating system command execution on the server.
• Bypass of static security scanner, allowing malicious components to evade detection.
• Possible exploitation through custom component source code submissions.
• Need for verification of vulnerable versions and exposure to custom component submissions.

Technical summary

The vulnerability exists in IBM Langflow OSS versions 1.0.0 through 1.11.5, where an attacker can bypass the static security scanner by crafting an annotated class-body assignment. This allows potential execution of arbitrary operating system commands on the server. The issue arises from a logic error that prevents the scanner from checking resolved values against a blocklist of dangerous callables, enabling malicious components to evade detection. Defenders should prioritize verifying vulnerable versions, assessing exposure to custom component submissions, and implementing compensating controls to mitigate potential impacts.

Defensive priority

Defenders should prioritize verifying the presence of vulnerable IBM Langflow OSS versions and assessing exposure to custom component source code submissions.

Recommended defensive actions

• Verify the presence of vulnerable IBM Langflow OSS versions in your environment.
• Assess exposure to custom component source code submissions.
• Implement compensating controls to monitor and restrict suspicious activity.
• Review relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description and CVSS score. However, additional information on affected versions and remediation steps is limited. Defenders should verify vulnerable versions, assess exposure to custom component submissions, and implement compensating controls. The logic error in IBM Langflow OSS allows attackers to bypass security scanners, potentially leading to arbitrary command execution. Evidence is based on CVE and NVD data, with limitations noted in source-prov

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.