CVE-2026-3340: IBM Langflow Desktop 1.0.0 through 1.8.4 IBM Langflow is vulnerable to server-side request forgery (SSRF)

Routine

MEDIUM 6.5REMOTEUPGRADE

CVE-2026-3340 is a medium-severity flaw (CVSS 6.5) affecting langflow desktop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM Langflow Desktop 1.0.0 through 1.8.4 IBM Langflow is vulnerable to server-side request forgery (SSRF). This may allow an authenticated attacker to send unauthorized requests from the system, potentially leading to network enumeration or facilitating other attacks.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-30
Last modified	2026-10-26

Publisher (CNA): IBM Corporation · Vendor: langflow

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-30 21:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

langflow langflow desktop UPGRADE

Affected: >= 1.0.0 and <= 1.8.4

Fixed in: newer than 1.8.4

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy langflow-desktop || rpm -q langflow-desktop || langflow-desktop --version

2. UPGRADE to newer than 1.8.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade langflow-desktop

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade langflow-desktop

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-desktop sudo apt install langflow-desktop=<VERSION_BEFORE_1.0.0> sudo apt-mark hold langflow-desktop

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list langflow-desktop sudo dnf downgrade langflow-desktop-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add langflow-desktop

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-2026-3340?

langflow desktop: upgrade to newer than 1.8.4. Exact commands for each OS are on this page.

Is CVE-2026-3340 being exploited?

CVE-2026-3340 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-2026-3340 affect?

CVE-2026-3340 affects langflow desktop. Severity is medium (CVSS 6.5). IBM Langflow Desktop 1.0.0 through 1.8.4 IBM Langflow is vulnerable to server-side request forgery (SSRF). This may allow an authenticated attacker to send unauthorized requests from the system, potentially leading to network enumeration or

How urgent is CVE-2026-3340?

Priority 29/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-6543 HIGH 8.8 UPGRADE IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow allows an attacker to execute arbitrary commands with the pr
CVE-2026-4503 HIGH 7.5 UPGRADE IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow could allow an unauthenticated user to view other users' ima
CVE-2026-3345 MEDIUM 6.5 UPGRADE IBM Langflow Desktop <=1.8.4 Langflow could allow a remote attacker to traverse directories on the system
CVE-2026-4502 MEDIUM 6.5 UPGRADE IBM Langflow Desktop 1.2.0 through 1.8.4 Langflow could allow an authenticated attacker to traverse directorie
CVE-2026-3346 MEDIUM 6.4 UPGRADE IBM Langflow Desktop 1.6.0 through 1.8.4 Lanflow is vulnerable to stored cross-site scripting

References

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