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PatchSiren cyber security CVE debrief

CVE-2025-3248 Langflow CVE debrief

CVE-2025-3248 is a missing authentication vulnerability in Langflow that CISA added to the Known Exploited Vulnerabilities catalog on 2025-05-05. Because it is on KEV, organizations should treat affected Langflow deployments as urgent remediation candidates and act before the 2025-05-26 due date.

Vendor
Langflow
Product
Langflow
CVSS
CRITICAL 9.8
CISA KEV
Listed
Original CVE published
2025-05-05
Original CVE updated
2025-05-05
Advisory published
2025-05-05
Advisory updated
2025-05-05

Who should care

Langflow administrators, platform and cloud teams, application owners, and security teams responsible for any exposed or internet-reachable Langflow deployment.

Technical summary

The supplied corpus identifies CVE-2025-3248 as a missing authentication vulnerability in Langflow. CISA’s KEV entry indicates the issue is known to be exploited in the wild and directs affected users to apply vendor mitigations, follow BOD 22-01 guidance for cloud services where applicable, or discontinue use if mitigations are unavailable.

Defensive priority

Urgent. KEV inclusion means this issue should be prioritized ahead of routine patch work, especially for any deployment that is exposed to untrusted networks or used in production.

Recommended defensive actions

  • Identify every Langflow deployment, including test, staging, and cloud-hosted instances.
  • Apply vendor-provided mitigations as soon as possible; use the official CVE/NVD records to track any linked remediation guidance.
  • If the product is hosted as a cloud service, follow applicable BOD 22-01 guidance.
  • If effective mitigations are not available, discontinue use of the affected product until it can be secured.
  • Verify that no Langflow instance is exposed without authentication or other compensating controls.
  • Track remediation against the CISA KEV due date of 2025-05-26.

Evidence notes

CISA’s KEV feed lists CVE-2025-3248 as “Langflow Missing Authentication Vulnerability,” marks it as added on 2025-05-05, and sets a due date of 2025-05-26. The KEV notes also state that the issue affects a common open-source project and direct readers to the official CVE and NVD records.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-3248 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-3248

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

  • CVE-2025-3248 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-3248

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

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

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.