CVE-2026-78205CWE-918ssrf

CVE-2026-78205

Medium · published August 24, 2026

CVSS v3.1
5.8
EPSS
0%
Percentile
34.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
EPSS
0.00410 · 34.1th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-08-24T05:16Z
References (4)
https://github.com/bentoml/BentoML · [email protected]https://github.com/bentoml/BentoML/blob/v1.4.39/src/bentoml/_internal/utils/uri.py#L89-L96 · [email protected]https://github.com/bentoml/BentoML/issues/5644 · [email protected]https://www.vulncheck.com/advisories/bentoml-through-server-side-request-forgery-via-unfiltered-rfc-6598-shared-address-space · [email protected]
EPSS history
Timeline
  • 24 AUG 00:30Z
    BentoML 1.4.19 through 1.4.39 Server-Side Request Forgery via Unfiltered RFC 6598 Shared Address Space
    cvelistv5