CVE-2026-40100: FastGPT is an AI Agent building platform

Q: How do I fix CVE-2026-40100?

fastgpt: upgrade to 4.14.10.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-40100 being exploited?

CVE-2026-40100 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40100 affect?

CVE-2026-40100 affects fastgpt. Severity is medium (CVSS 5.3). FastGPT is an AI Agent building platform. Prior to 4.14.10.3, the /api/core/app/mcpTools/runTool endpoint accepts arbitrary URLs without authentication. The internal IP check in isInternalAddress() only blocks private IPs when CHECK_INTERNA

Q: How urgent is CVE-2026-40100?

Priority 28/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-40100 is a medium-severity flaw (CVSS 5.3) affecting fastgpt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FastGPT is an AI Agent building platform. Prior to 4.14.10.3, the /api/core/app/mcpTools/runTool endpoint accepts arbitrary URLs without authentication. The internal IP check in isInternalAddress() only blocks private IPs when CHECK_INTERNAL_IP=true, which is not the default. This allows unauthenticated attackers to perform SSRF against internal network resources. This vulnerability is fixed in 4.14.10.3.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-10
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: fastgpt

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

Am I affected?

Timeline

2026-04-10 17:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

fastgpt fastgpt UPGRADE

Affected: < 4.14.10.3

Fixed in: 4.14.10.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fastgpt || rpm -q fastgpt || fastgpt --version

2. UPGRADE to 4.14.10.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fastgpt

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fastgpt

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-40100?

fastgpt: upgrade to 4.14.10.3. Exact commands for each OS are on this page.

Is CVE-2026-40100 being exploited?

CVE-2026-40100 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-2026-40100 affect?

CVE-2026-40100 affects fastgpt. Severity is medium (CVSS 5.3). FastGPT is an AI Agent building platform. Prior to 4.14.10.3, the /api/core/app/mcpTools/runTool endpoint accepts arbitrary URLs without authentication. The internal IP check in isInternalAddress() only blocks private IPs when CHECK_INTERNA

How urgent is CVE-2026-40100?

Priority 28/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40351 CRITICAL 9.8 UPGRADE FastGPT is an AI Agent building platform
CVE-2026-40352 HIGH 8.8 UPGRADE FastGPT is an AI Agent building platform
CVE-2026-40252 HIGH 8.1 UPGRADE FastGPT is an AI Agent building platform

References

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