IBM Langflow OSS: Deserialization of untrusted data allows code execution
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.3 deserialize untrusted data from the message broker. A remote attacker who can reach the message broker can execute arbitrary code on the system. The NVD record rates the issue CVSS 9.8 (critical), but other sources rate it lower, so the score should be verified. No exploitation is known.
Affected
- IBM Langflow OSS 1.0.0 through 1.12.3
Fixed in
- Upgrade to Langflow OSS 1.12.4 (IBM's recommendation in the CVE record).
- A later IBM bulletin (7294467) and third-party sources recommend 1.13.0 because other Langflow vulnerabilities are not fixed in 1.12.4. Unverified.
Workaround
- Vendor-documented workaround: Unknown.
- If a message broker is used, make sure it cannot be reached from outside the deployment (third-party advice, not an IBM fix).
Exploitation
- No evidence of active exploitation found.
- No public exploit known (VulDB).
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
Our recommendation
- Check whether Langflow OSS is deployed and which version is running.
- Upgrade to 1.12.4 or, preferably, 1.13.0, and test flows after the upgrade.
- Restrict access to the message broker to the Langflow components only.
- Check whether Langflow instances are reachable from the internet, especially with default auto-login settings.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- IBM Security Bulletin 7293015 www.ibm.com
- Strix CVE-2026-104317 www.strix.ai
- CVE threatint CVE-2026-104317 cve.threatint.com
- Langflow release v1.12.4 github.com
- VulDB 428483 vuldb.com
- HOL blog on Langflow upgrade to 1.13.0 hol.org
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 who could reach the message broker to execute arbitrary code on the system due to the deserialization of untrusted data.
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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