IBM Langflow OSS: Remote code execution by authenticated users
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.2 contain a flaw caused by improper input validation (CWE-693). A remote attacker with a valid low-privilege account can execute arbitrary code without user interaction. Code runs with the privileges of the Langflow service, which often holds API keys and access to other internal systems. The flaw is one of about 25 Langflow issues IBM disclosed together; several of those are unauthenticated and more severe.
Affected
- IBM Langflow OSS 1.0.0 through 1.12.2
Fixed in
- Upgrade to Langflow OSS 1.12.3 or later, as recommended by IBM.
Workaround
Unknown. No CVE-specific workaround was confirmed in the vendor bulletin.
Exploitation
- No known exploitation in the wild.
- Not listed in CISA KEV.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- No public proof-of-concept found in searches; this does not prove none exists.
Our recommendation
- Inventory all Langflow OSS instances and identify versions 1.0.0 to 1.12.2.
- Upgrade to Langflow OSS 1.12.3 or later, prioritising internet-facing instances and instances with many user accounts.
- Restrict Langflow accounts to people who need them and review account access.
- Keep Langflow off the public internet where possible.
- Review logs for unexpected flow edits or executions.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- IBM Security Bulletin: Langflow OSS is affected by multiple vulnerabilities www.ibm.com
- OSV: CVE-2026-97673 osv.dev
- VulDB: CVE-2026-97673 vuldb.com
- GBHackers: IBM patches multiple Langflow OSS flaws gbhackers.com
- OpenCVE: CVE-2026-97673 app.opencve.io
- Red Packet Security: CVE-2026-97673 alert www.redpacketsecurity.com
- Strix: CVE-2026-97673 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 21:27.
Original description (NVD)
IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote authenticated attacker to execute arbitrary code due to improper input validation.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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