IBM Langflow OSS: Code injection enables remote code execution
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.2 contain a code generation flaw (CWE-94) that can allow a remote attacker to execute arbitrary code on the server. The CVSS vector scores the flaw as needing no privileges and no user interaction, so a successful attack could lead to full compromise of the affected system. IBM's bulletin is the authority on whether authentication is needed, and a sibling CVE is described as requiring an authenticated attacker, so the worst case should be assumed until the bulletin is checked.
Affected
- IBM Langflow OSS 1.0.0 through 1.12.2
Fixed in
- Upgrade to IBM Langflow OSS 1.12.3 or later, as recommended by IBM. Check the IBM bulletin for later fixes.
Workaround
- Unknown. IBM lists no workaround.
- Interim measure from a third-party incident-response write-up: keep Langflow off the public internet and limit who can create or edit flows.
Exploitation
- Not known to be exploited in the wild according to current sources. CISA SSVC lists exploitation as none.
- No public proof-of-concept confirmed.
- Langflow has other actively exploited flaws in 2026, but those are separate CVEs.
Our recommendation
- Inventory all Langflow instances, including developer test instances and containers.
- Upgrade to Langflow OSS 1.12.3 or later as soon as possible.
- Restrict network access to Langflow and keep it off the public internet.
- Limit who can create or edit flows.
- After patching, rotate API keys and credentials stored in the platform.
- Review logs for unusual activity.
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
- Radar Offseq: CVE-2026-104334 radar.offseq.com
- The Hacker Wire: CVE-2026-104334 www.thehackerwire.com
- GBHackers: IBM patches multiple Langflow OSS flaws gbhackers.com
- Incident response checklist for Langflow OSS 1.0.0 through 1.12.2 dev.to
- Safeguard.sh: CVE-2026-93449 IBM Langflow code generation safeguard.sh
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 30 Oct 2026, 20:53.
Original description (NVD)
IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote attacker to execute arbitrary code due to improper control of code generation.
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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