IBM Langflow OSS: Remote code execution via improper access control
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.2 contain an improper access control flaw. A remote attacker with a valid user account can execute arbitrary code on the host running Langflow. No user interaction is required, and the attack can be carried out over the network with low complexity. A compromised host could expose stored API keys and cloud credentials.
Affected
- IBM Langflow OSS 1.0.0 through 1.12.2
Fixed in
- Upgrade to Langflow OSS 1.12.3 or later (IBM recommendation per the CVE record)
Workaround
Unknown. No vendor workaround is documented for this CVE.
Exploitation
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- Not listed as known exploited (KEV) in the sources reviewed.
- No public proof of concept found; this does not rule out that one exists.
Our recommendation
- Upgrade Langflow OSS to 1.12.3 or later as soon as possible.
- Remove direct internet exposure or restrict access to VPN or trusted IP ranges.
- Review user accounts, disable open self-registration and enforce strong passwords.
- Limit the secrets (API keys, cloud credentials) available to the Langflow process and rotate them if exposure is suspected.
- Monitor logs for unusual flow creation and unexpected child processes of the Langflow service.
Public exploits
Links to third-party sites, not checked by us – exploit code can contain malware. Only use it in isolated test environments.
- Proof of concept on GitHub (1 repositories)
Farih123/CVE-2026-104335
Research sources
- IBM Security Bulletin www.ibm.com
- OSV: CVE-2026-104335 osv.dev
- VulDB: CVE-2026-104335 vuldb.com
- GBHackers: IBM patches multiple Langflow OSS flaws gbhackers.com
- HOL Guard: CVE-2026-104335 hol.org
- Strix: CVE-2026-104335 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, 21:33.
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 access control.
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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