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CVE-2026-12942 IBM CVE debrief

CVE-2026-12942 debrief: IBM Langflow OSS 1.0.0 through 1.10.1 could allow a remote attacker to traverse directories on the system. This high-severity vulnerability enables attackers to send specially crafted URL requests containing 'dot dot' sequences (/.. /) to view arbitrary files on the system. Defenders should assess exposure and prioritize remediation to prevent potential unauthorized file access and data exposure. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity.

Vendor
IBM
Product
Langflow OSS
CVSS
HIGH 7.5
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 IBM Langflow OSS deployments should assess exposure and prioritize remediation. This includes verifying affected systems, reviewing configurations, and applying remediation to prevent potential unauthorized file access and data exposure. Security teams and operators managing IBM Langflow OSS should review the vulnerability details and take necessary actions to protect their systems.

Why it matters

CVE-2026-12942 is a high-severity vulnerability in IBM Langflow OSS that allows directory traversal attacks. Defenders should prioritize verifying affected systems, reviewing configurations, and applying remediation to prevent potential unauthorized file access and data exposure.

  • Potential unauthorized file access
  • Need to verify affected systems and configurations
  • Possible data exposure through file traversal
  • Remediation priority for Langflow OSS deployments

Technical summary

IBM Langflow OSS 1.0.0 through 1.10.1 is vulnerable to directory traversal attacks. An attacker could send a specially crafted URL request containing 'dot dot' sequences (/.. /) to view arbitrary files on the system. This vulnerability has a CVSS score of 7.5 and is considered HIGH severity. Defenders should prioritize verifying affected systems, reviewing directory traversal protections, and applying vendor remediation.

Defensive priority

Defenders should prioritize verifying affected systems, reviewing directory traversal protections, and applying vendor remediation.

Recommended defensive actions

  • Verify if systems are using affected IBM Langflow OSS versions (1.0.0 through 1.10.1)
  • Review directory traversal protections and configurations
  • Apply vendor remediation when available
  • Monitor for unusual file access requests

Evidence notes

Evidence from the CVE Program and NVD indicates IBM Langflow OSS is vulnerable to directory traversal attacks. The CVE description and NVD detail page provide information on the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12942 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12942

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

  • CVE-2026-12942 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12942

    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.