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CVE-2026-13435 IBM CVE debrief

IBM Langflow OSS versions 1.0.0 through 1.10.1 contain an improper input validation vulnerability in the PythonREPL sandbox implementation, which may impact systems using affected versions. This vulnerability could allow attackers to execute arbitrary code, potentially leading to unauthorized access or data breaches. Defenders should assess exposure and prioritize remediation efforts to prevent exploitation. The CVE record and NVD entry provide details on the vulnerability, including its severity and potential impact.

Vendor
IBM
Product
Langflow OSS
CVSS
CRITICAL 9.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-30
Original CVE updated
2026-10-23
Advisory published
2026-07-30
Advisory updated
2026-10-23

Who should care

Defenders responsible for systems using IBM Langflow OSS versions 1.0.0 through 1.10.1 should assess exposure and potential impact. This includes operators, platform administrators, vulnerability management teams, and security teams. They should prioritize remediation efforts to prevent exploitation and review compensating controls for exposed systems.

Why it matters

The CVE record and NVD entry provide details on the improper input validation vulnerability in IBM Langflow OSS, which may impact systems using affected versions.

  • Verify exposure of systems using IBM Langflow OSS versions 1.0.0 through 1.10.1.
  • Assess potential impact on systems using the affected versions.
  • Monitor for vendor remediation or updates to IBM Langflow OSS.

Technical summary

IBM Langflow OSS versions 1.0.0 through 1.10.1 are vulnerable to an improper input validation issue in the PythonREPL sandbox implementation. This vulnerability could allow attackers to execute arbitrary code, potentially leading to unauthorized access or data breaches. The vulnerability is considered critical, with a CVSS score of 9.9. Defenders should prioritize verifying exposure and assessing potential impact.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, focusing on systems using IBM Langflow OSS versions 1.0.0 through 1.10.1.

Recommended defensive actions

  • Verify if systems using IBM Langflow OSS versions 1.0.0 through 1.10.1 are exposed to the improper input validation vulnerability.
  • Assess potential impact on systems using the affected versions.
  • Monitor for vendor remediation or updates to IBM Langflow OSS.

Evidence notes

The CVE record and NVD entry provide details on the improper input validation vulnerability in IBM Langflow OSS, which may impact systems using affected versions. Evidence is limited to publicly available information from the CVE Program and NVD. Defenders should verify exposure and assess potential impact based on this information. Additional details may be available from the vendor or other sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13435 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13435

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

  • CVE-2026-13435 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13435

    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.