Langflow DoS Vulnerability, CVSS 9.6, Remote Attack
Summary
CERT-Bund issued advisory WID-SEC-2026-1284 disclosing a critical denial-of-service vulnerability in Open Source Langflow versions prior to 1.9.0. The vulnerability carries a CVSS Base Score of 9.6 (critical) and a CVSS Temporal Score of 8.6 (high), with remote attack capability confirmed. Affected platforms include Linux, UNIX, Windows, and other operating systems. Organizations running Langflow in their environments should apply available mitigations immediately, as an authenticated remote attacker can exploit this flaw to disrupt service availability.
“Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Langflow ausnutzen, um einen Denial of Service Angriff durchzuführen.”
Organizations running Langflow for LLM-based application development should treat this advisory as requiring immediate action given the CVSS 9.6 score and confirmed remote attack vector. Even in environments where the service is internally facing, an authenticated insider could exploit this flaw to disrupt AI development workflows.
About this source
CERT-Bund is the German federal cybersecurity agency's incident response team, run by the BSI. Their advisory feed publishes vulnerability disclosures and active exploitation warnings for software in widespread enterprise use: VPN appliances, email servers, file transfer products, ERP systems, browsers, hypervisors. Around 280 advisories a month, each with a CVSS score, affected versions, and remediation guidance. The advisories are written in German but cover the same vulnerabilities that show up in CISA, NCSC-UK, and JPCERT bulletins, often hours earlier. Watch this if you patch enterprise software, run a SOC, or write detection rules. GovPing publishes each advisory with the affected vendor, CVSS score, and original CERT-Bund link.
What changed
CERT-Bund published advisory WID-SEC-2026-1284 alerting to a critical denial-of-service vulnerability in Open Source Langflow versions before 1.9.0. The vulnerability carries a CVSS Base Score of 9.6 (critical) and a CVSS Temporal Score of 8.6 (high), with remote attack vector confirmed. No specific CVE number or vendor patch link is embedded in this advisory record.
Organizations deploying Langflow as a visual interface for LLM-based applications should prioritize immediate mitigation. Security teams should identify all instances running version 1.9.0 or earlier, assess exposure to remote authenticated attackers, and implement available compensating controls to reduce denial-of-service risk.
Archived snapshot
Apr 27, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
[WID-SEC-2026-1284] Langflow: Schwachstelle ermöglicht Denial of Service CVSS Base Score 9.6 (kritisch) CVSS Temporal Score 8.6 (hoch) Remoteangriff ja Datum 26.04.2026 Stand 27.04.2026 Mitigation ja
Betroffene Systeme
Betriebssystem
- Linux
- Sonstiges
- UNIX
- Windows
Produktbeschreibung
Langflow bietet eine visuelle Schnittstelle zum Erstellen von LLM-basierten Anwendungen.
Produkte
26.04.2026
- Open Source Langflow <1.9.0
Angriff
Angriff
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Langflow ausnutzen, um einen Denial of Service Angriff durchzuführen. CVE Informationen Versionshistorie Feedback zum Advisory geben
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Source document text, dates, docket IDs, and authority are extracted directly from CERT-Bund.
The summary, classification, recommended actions, deadlines, and penalty information are AI-generated from the original text and may contain errors. Always verify against the source document.
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