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Vulnerability details

CVE-2026-42345

labring FastGPT

FastGPT: Cloud metadata endpoint SSRF protection bypass via port specification, IPv6 mapping, hex/decimal IP encoding, and trailing dot

CVSS 3.1
7.7High

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.

CVSS scores

ScoreVersionSourceVector
7.7High 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected products

VendorProductVersionsSource
labring FastGPT <= 4.14.11 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-05-09
Last updated
2026-05-13
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.21%
Probability of exploitation in 30 days
11.6%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-918
    Server-Side Request Forgery (SSRF)