CVE-2026-78205Medium· 5.8▾ Sunlit

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)

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score32/ 100 · Low

impact 31.9 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Aug 24, 2026

Updated

Sep 24, 2026

CVSS

5.8

Vendor

—

Product

—

CWE

CWE-918

Depth score

32 · Low

EPSS

0.41% · p32

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 31 days

Aug 24, 2026Published
Disclosed via NVD
Sep 24, 2026Record revised
Last analysed / modified upstream
Sep 24, 2026EPSS first tracked
0.4%

CWE-918 #nvd

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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