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CVE-2026-81211 IBM CVE debrief

IBM Langflow OSS 1.0.0 through 1.11.5 is vulnerable to arbitrary Python code execution due to improper authorization of custom components in stored flows. This vulnerability allows remote authenticated attackers to execute arbitrary Python code, emphasizing the need for verification and remediation. Defenders responsible for IBM Langflow OSS deployments, especially those with remote authenticated access, should assess exposure and prioritize remediation. The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation steps is limited.

Vendor
IBM
Product
Langflow OSS
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-10
Original CVE updated
2026-09-16
Advisory published
2026-09-10
Advisory updated
2026-09-16

Who should care

Defenders responsible for IBM Langflow OSS deployments, especially those with remote authenticated access, should assess exposure and prioritize remediation.

Why it matters

This vulnerability allows remote authenticated attackers to execute arbitrary Python code in IBM Langflow OSS deployments, emphasizing the need for verification and remediation.

  • Remote authenticated attackers can execute arbitrary Python code
  • Improper authorization of custom components in stored flows allows for code execution
  • Verification of affected versions and remediation steps is necessary

Technical summary

IBM Langflow OSS 1.0.0 through 1.11.5 is vulnerable to arbitrary Python code execution due to improper authorization of custom components in stored flows. An attacker with remote authenticated access can exploit this vulnerability. The vulnerability emphasizes the need for verification and remediation in IBM Langflow OSS deployments, especially in environments with remote authenticated access.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability in IBM Langflow OSS deployments, especially in environments with remote authenticated access.

Recommended defensive actions

  • Verify IBM Langflow OSS version and check for updates
  • Review and restrict custom component authorization in stored flows
  • Monitor for suspicious activity in Langflow OSS deployments

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation steps is limited. Defenders should verify the affected versions and review custom component authorization in stored flows. The vulnerability allows remote authenticated attackers to execute arbitrary Python code due to improper authorization of custom components in stored flows. Verification of affected versions and remediation steps is necessary.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-81211 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-81211

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-81211 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-81211

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.