CVE-2026-42345
highpriority · track · 0EPSS 0.002 · 12 %ileEUEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (1)
Products and version ranges known to be affected.
also known as (2)
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sources
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references (5)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2026-42345cnnvd
- https://github.com/labring/FastGPT/releasesPatchcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-42345cnnvd
- https://github.com/labring/FastGPT/security/advisories/GHSA-jhqw-944x-xh94enisa_euvd
- https://github.com/labring/FastGPT/security/advisories/GHSA-jhqw-944x-xh94nvd
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