CVE-2026-10547: IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate ownership in the deprecated POST /api/v1/buil

Routine

MEDIUM 5.9UPGRADE

CVE-2026-10547 is a medium-severity flaw (CVSS 5.9) 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 does not properly validate ownership in the deprecated POST /api/v1/build/{flow_id}/vertices endpoint, allowing an authenticated user to inject arbitrary graph data into a shared cache for any flow. This may result in cross-user cache pollution, unauthorized workflow execution, or denial of service.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-08-05
Last modified	2026-10-23

Publisher (CNA): IBM Corporation · Vendor: langflow

Am I affected?

Timeline

2026-08-05 19:17 UTCPublished CVE record published
2026-10-23 21:10 UTCUpdated 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.

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.

Quick answers

How do I fix CVE-2026-10547?

langflow: upgrade to 1.11.0. Exact commands for each OS are on this page.

Is CVE-2026-10547 being exploited?

CVE-2026-10547 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-10547 affect?

CVE-2026-10547 affects langflow. Severity is medium (CVSS 5.9). IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate ownership in the deprecated POST /api/v1/build/{flow_id}/vertices endpoint, allowing an authenticated user to inject arbitrary graph data into a shared cache for any flow. Thi

How urgent is CVE-2026-10547?

Priority 29/100. No elevated risk signals yet.

Related CVEs

CVE-2026-8182 HIGH 8.8 UPGRADE IBM Langflow OSS 1.0.0 through 1.10.3 installations allow anyone on the internet to execute arbitrary code on
CVE-2026-8478 HIGH 8.8 UPGRADE IBM Langflow OSS 1.0.0 through 1.10.3 could allow a remote attacker to inject arbitrary code on the system, du
CVE-2026-8446 HIGH 7.5 UPGRADE IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Prot
CVE-2026-9196 HIGH 8.1 UPGRADE IBM Langflow OSS 1.0.0 through 1.10.3 could allow an authenticated attacker to execute unintended code during
CVE-2026-8183 HIGH 7.7 UPGRADE IBM Langflow OSS 1.0.0 through 1.10.3, 1.0.0 through 1.10.3, 1.0.0 through 1.10.3, 1.0.0 through 1.10.3, 1.0.0

References

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