FastGPT is an open-source LLM platform for building AI applications on a knowledge base. Prior to 4.15.2, the safe Axios request interceptor in packages/service/common/api/axios.ts validates a hostname with isInternalAddress() before a later HTTP connection performs an independent DNS lookup, creating a DNS rebinding window, allowing an attacker-controlled hostname to resolve publicly during the check and to a loopback, private, link-local, or metadata address during connection. An authenticated attacker who can supply a URL to a safe-Axios-backed HTTP tool, workflow HTTP node, external file fetch, or other server-side integration can use this time-of-check/time-of-use gap to reach services that direct private-address inputs would block. The same independent re-resolution occurs after manual redirect hops because each redirect target is checked before a separate connection lookup. This issue is fixed in version 4.15.2.
CVE-2026-84301
This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.3
- EG Score
- 6.3(medium)
- EG Risk
- 33(Track)EG Risk 33/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity63% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 27%
- KEV
- Not listed
Published
September 22, 2026
Last Modified
September 22, 2026
Advisory Details (4)
Auto-updated Sep 22, 2026v4.15.2
Patch available: labring/FastGPT v4.15.2
https://github.com/labring/FastGPT/releases/tag/v4.15.2commit 0a38565c9d1f (labring/FastGPT)
Fix landed in labring/FastGPT commit 0a38565c9d1f — awaiting tagged release
https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7fix: pin DNS for safe axios direct requests
Fix merged in labring/FastGPT PR #7261 on 2026-07-06 — awaiting tagged release
https://github.com/labring/FastGPT/pull/7261FastGPT safe axios SSRF guard still allows DNS rebinding TOCTOU on protected outbound requests · Advisory · labring/FastGPT · GitHub
https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-24 17:59 UTCEG score recompute
- 2026-09-24 14:04 UTCEPSS rescore
- 2026-09-23 17:54 UTCEPSS rescore
- 2026-09-22 17:34 UTCEG score recompute
- 2026-09-22 16:58 UTCEG score recompute
- 2026-09-22 16:54 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
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Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-84301
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