IBM Langflow OSS up to 1.10.3 Username path traversal

Summaryinfo

A vulnerability has been found in IBM Langflow OSS up to 1.10.3 and classified as critical. This affects an unknown function. Performing a manipulation of the argument Username results in path traversal. This vulnerability is identified as CVE-2026-7658. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in IBM Langflow OSS up to 1.10.3. This affects an unknown part. The manipulation of the argument username with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate the username field, allowing attackers to inject path traversal sequences and bypass containment checks. This enables multiple severe impacts, including arbitrary directory deletion, cross-tenant data destruction, and JWT signing key deletion leading to session invalidation.

The advisory is shared at ibm.com. This vulnerability is uniquely identified as CVE-2026-7658 since 05/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/05/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• IBM

Name

• Langflow OSS

Version

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3

License

• commercial

Website

• Vendor: https://www.ibm.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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