{"id":"CVE-2026-78205","state":"PUBLISHED","title":"BentoML 1.4.19 through 1.4.39 Server-Side Request Forgery via Unfiltered RFC 6598 Shared Address Space","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.","publishedAt":"2026-08-24T00:30:45.786Z","updatedAt":"2026-08-24T19:02:28.061Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["bentoml BentoML"],"affected":[{"vendor":"bentoml","product":"BentoML","packageURL":"pkg:pypi/bentoml","defaultStatus":"unaffected","versions":[{"version":"1.4.19","status":"affected","lessThanOrEqual":"1.4.39","versionType":"semver"}]}],"references":["https://github.com/bentoml/BentoML/issues/5644","https://github.com/bentoml/BentoML","https://github.com/bentoml/BentoML/blob/v1.4.39/src/bentoml/_internal/utils/uri.py#L89-L96","https://www.vulncheck.com/advisories/bentoml-through-server-side-request-forgery-via-unfiltered-rfc-6598-shared-address-space"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/78xxx/CVE-2026-78205.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-78205","state":"PUBLISHED","datePublished":"2026-08-24T00:30:45.786Z","dateUpdated":"2026-08-24T19:02:28.061Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-23T23:45:12.185Z"},"containers":{"cna":{"title":"BentoML 1.4.19 through 1.4.39 Server-Side Request Forgery via Unfiltered RFC 6598 Shared Address Space","descriptions":[{"lang":"en","value":"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). 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