IBM Langflow OSS: Code execution via sandbox escape
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.2 contain a flaw that allows a remote attacker with a valid user account to execute arbitrary code. The flaw is a sandbox escape caused by improper neutralization of special elements used in code. The attack requires authentication, but any account that can create or run flows could reach code execution on the server.
Affected
- IBM Langflow OSS 1.0.0 through 1.12.2
Fixed in
- Upgrade to IBM Langflow OSS 1.12.3 (IBM recommendation; the remediation line for this CVE could not be fully confirmed in the retrieved bulletin text, so verify on the IBM page)
Workaround
- No vendor workaround is listed by IBM.
- Interim measures (not from the vendor): limit who can create or edit flows, restrict network access to the Langflow UI and API, and review flow-creation activity.
Exploitation
- No evidence of exploitation in the wild for this specific CVE was found.
- No public proof-of-concept was found.
- CISA KEV status not verified.
- CISA SSVC assessment: exploitation none, not automatable, total technical impact.
Our recommendation
- Upgrade Langflow OSS to 1.12.3 as soon as possible.
- Check whether Langflow is reachable from the internet and whether auto-login is still enabled; if so, disable it, since it removes the authentication barrier.
- Restrict accounts and flow-editing rights to trusted users and review existing accounts.
- Monitor flow creation and execution logs for unexpected 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
- GBHackers: IBM patches multiple Langflow OSS flaws gbhackers.com
- CyberPress: IBM patches critical Langflow vulnerabilities cyberpress.org
- OffSeq Radar: CVE-2026-97676 radar.offseq.com
- Incident response checklist for Langflow OSS 1.0.0 through 1.12.2 dev.to
- Forkast: Langflow's 12th exploited CVE confirms AI frameworks are credential harvesting infrastructure forkast.news
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 neutralization of special elements used in code, resulting in a sandbox escape.
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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