Is CVE-2026-42345 actively exploited?

No active exploitation of CVE-2026-42345 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42345 be exploited remotely?

Yes. CVE-2026-42345 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42345?

CVE-2026-42345 has a CVSS score of 7.7 (HIGH).

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HIGH

CVE-2026-42345

CWE-918Published: May 8, 2026· Updated: May 12, 2026

7.7

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.1th

Official Description

FastGPT is an AI Agent building platform. In versions 4.14.11 and prior, FastGPT's isInternalAddress() function in packages/service/common/system/utils.ts blocks cloud metadata endpoints using a fullUrl.startsWith() check against a hardcoded list. This check can be bypassed using at least 7 different URL encoding techniques, all of which resolve to the same cloud metadata service but do not match the blocklist patterns. Additionally, the broader private IP check (isInternalIPv4/isInternalIPv6) is disabled by default because CHECK_INTERNAL_IP defaults to false (not 'true'), so these bypasses reach the metadata endpoint without any further validation. At time of publication, there are no publicly available patches.

NVD Source

Technical Analysis

CVE-2026-42345 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.7.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.