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IBM Langflow OSS EUVDEUVD-2026-67954

| CVE-2026-18899 HIGH
Path Traversal (CWE-22)
2026-08-28 ibm GHSA-4w6q-3qxv-hmwg
Path Traversal IBM Langflow Oss
7.5
CVSS 3.1 · Vendor: ibm
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Severity by source

Vendor (ibm) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
7.5 HIGH

Unauthenticated network path traversal with read-only file impact supports AV:N, PR:N, C:H, and I:N/A:N with no scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (ibm).

CVSS VectorVendor: ibm

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Aug 28, 2026 - 22:30 vuln.today
CVE Published
Aug 28, 2026 - 20:51 nvd
HIGH 7.5

DescriptionCVE.org

IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to read arbitrary files due to path traversal.

AnalysisAI

Path traversal in IBM Langflow OSS 1.0.0 through 1.11.1 exposes arbitrary server-side files to unauthenticated remote attackers over the network. The CVSS vector (AV:N/AC:L/PR:N/UI:N) confirms low-complexity exploitation requiring no credentials or user interaction, with high confidentiality impact limited to file reads - no write or availability impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation No special conditions are required - the CVSS vector (AV:N/AC:L/PR:N/UI:N) indicates remote unauthenticated exploitation against IBM Langflow OSS in its default configuration across all versions 1.0.0 through 1.11.1. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 7.5 (High) accurately reflects the attack profile: unauthenticated, network-accessible, low complexity, no user interaction, with high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor-released patch referenced in IBM's advisory at https://www.ibm.com/support/pages/node/7284579; the exact patched version number is confirmed available per vendor but is not specified in the available intelligence and must be verified directly from the advisory before deployment. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: audit your infrastructure to identify all Langflow OSS deployments and versions, particularly internet-facing systems; document what sensitive data resides on these servers. …

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Same weakness CWE-22 – Path Traversal

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Same technique Path Traversal

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EUVD-2026-67954 vulnerability details – vuln.today
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