PatchTheCVECVE-2026-8446: IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Prot
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HIGH 7.5REMOTEUPGRADE
CVE-2026-8446 is a high-severity flaw (CVSS 7.5) affecting langflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer endpoint when mcp_composer_enabled=true (default) and projects are configured with auth_type=oauth .
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 59%) |
| CISA exploited list | No |
| Weakness | CWE-306 |
| Published | 2026-08-05 |
| Last modified | 2026-10-23 |
Publisher (CNA): IBM Corporation · Vendor: langflow
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
langflow langflow UPGRADE
Affected: >= 1.0.0 and < 1.11.0
Fixed in: 1.11.0
Safe to downgrade to: a release before 1.0.0
1. Check installed version
apt-cache policy langflow || rpm -q langflow || langflow --version
2. UPGRADE to 1.11.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade langflow
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade langflow
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)
apt-cache madison langflow
sudo apt install langflow=<VERSION_BEFORE_1.0.0>
sudo apt-mark hold langflow
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list langflow
sudo dnf downgrade langflow-<VERSION_BEFORE_1.0.0>
sudo dnf versionlock add langflow
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source
sudo dnf upgrade --advisory=FEDORA-2026-95888f332b
Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source
sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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