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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是BentoML公司开源的一个机器学习模型服务工具。 BentoML 1.4.19版本至1.4.39版本存在服务端请求伪造漏洞，该漏洞源于出站连接保护（make_safe_connect）未过滤RFC 6598共享地址空间，攻击者可通过MultipartSerde.ensure_file或JSONSerde.parse_request提供指向该范围的URL，导致服务端请求伪造。

CVSS 5.8 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
bentoml BentoML 1.4.19≤ 1.4.39 affected
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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
Vulnerability Title
BentoML 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BentoML是BentoML公司开源的一个机器学习模型服务工具。 BentoML 1.4.19版本至1.4.39版本存在服务端请求伪造漏洞，该漏洞源于出站连接保护（make_safe_connect）未过滤RFC 6598共享地址空间，攻击者可通过MultipartSerde.ensure_file或JSONSerde.parse_request提供指向该范围的URL，导致服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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