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CVE-2026-78205— BentoML 1.4.19 through 1.4.39 Server-Side Request Forgery via Unfiltered RFC 6598 Shared Address Space

Quick assessment

Affected
bentoml BentoML
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BentoML 的出站连接安全机制（位于 _internal/utils/uri.py 中的 make_safe_connect 函数）会阻止对私有地址、回环地址和链路本地地址的访问，但未能正确拒绝 RFC 6598 共享地址空间（100.64.0.0/10，即 CGNAT 地址范围）。在 1.4.19 至 1.4.39 版本中，未经身份验证的攻击者可以通过多部分文件处理（MultipartSerde.ensure_file）或 JSON 请求解析（JSONSerde.parse_request）提供指向该地址范围

CVSS 5.8 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-78205

Vulnerability Information
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Vulnerability Title
BentoML 1.4.19 through 1.4.39 Server-Side Request Forgery via Unfiltered RFC 6598 Shared Address Space
Source: CVE Program / CVE List V5
Vulnerability Description
BentoML's outbound connection safeguard (make_safe_connect in _internal/utils/uri.py) blocks private, loopback, and link-local IP addresses but fails to reject the RFC 6598 shared address space (100.64.0.0/10, CGNAT). In versions 1.4.19 through 1.4.39, an unauthenticated attacker can supply URLs pointing to that range via multipart file handling (MultipartSerde.ensure_file) or JSON request parsing (JSONSerde.parse_request), causing the server to make outbound requests to internal hosts on CGNAT networks (Server-Side Request Forgery). This is an incomplete fix for CVE-2025-54381.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bentoml BentoML 1.4.19 ~ 1.4.39 -

II. Public POCs for CVE-2026-78205

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III. Intelligence Information for CVE-2026-78205

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Patches & Fixes for CVE-2026-78205 (1)

Vendor Advisories for CVE-2026-78205 (2)

Vendor Pages for CVE-2026-78205 (1)

IV. Related Vulnerabilities

Same product: BentoML
Same vendor: bentoml
Same weakness: CWE-918

V. Comments for CVE-2026-78205

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