Langflow OSS: Code injection enables remote code execution
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.3 contain an OS command injection flaw (CWE-94 per NVD, description matches CWE-78) that allows remote code execution on the server. According to the CVE record, an attacker needs no privileges and no user interaction, so the flaw is reachable over the network. The CVSS base score is 9.8 (critical), and the CVE was published on 29 October 2026.
Affected
- IBM Langflow OSS 1.0.0 to 1.12.3
Fixed in
- Upgrade to Langflow OSS 1.12.4 (IBM's recommended fix per the CVE record)
- A secondary source recommends 1.13.0 for new deployments and generally for all instances, because the newest releases also address further no-login issues
Workaround
Unknown. No vendor-documented workaround was found; upgrading is the only confirmed remediation.
Exploitation
- No public exploit is available according to VulDB.
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- In-the-wild exploitation: unknown; no evidence of attacks on this CVE was found.
Our recommendation
- Identify all Langflow OSS instances and check versions.
- Take internet-exposed instances offline or restrict access to trusted networks immediately.
- Upgrade to 1.12.4 or, preferably, 1.13.0, following IBM's upgrade instructions and back up the installation first.
- Do not rely on user accounts as a mitigation for this flaw.
- Monitor logs for unusual process execution and requests to the Langflow service.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- IBM Security Bulletin 7293015 www.ibm.com
- VulDB entry 428494 vuldb.com
- Strix CVE-2026-104339 www.strix.ai
- HOL blog: Langflow auth bypass and RCE upgrade guidance hol.org
- GitHub Security Advisory GHSA-vwmf-pq79-vjvx github.com
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, 16:07.
Original description (NVD)
IBM Langflow OSS 1.0.0 through 1.12.3 could allow a remote attacker to execute arbitrary code due to improper neutralization of special elements used in an OS command.
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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