{"id":"CVE-2026-35044","summary":"BentoML has a Server-Side Template Injection via unsandboxed Jinja2 Environment in Dockerfile generation","details":"BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.38, the Dockerfile generation function generate_containerfile() in src/bentoml/_internal/container/generate.py uses an unsandboxed jinja2.Environment with the jinja2.ext.do extension to render user-provided dockerfile_template files. When a victim imports a malicious bento archive and runs bentoml containerize, attacker-controlled Jinja2 template code executes arbitrary Python directly on the host machine, bypassing all container isolation. This vulnerability is fixed in 1.4.38.","aliases":["GHSA-v959-cwq9-7hr6","PYSEC-2026-159"],"modified":"2026-08-12T03:51:23.819597059Z","published":"2026-04-06T17:13:43.133Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35044.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-1336"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35044.json"},{"type":"ADVISORY","url":"https://github.com/bentoml/BentoML/security/advisories/GHSA-v959-cwq9-7hr6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35044"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bentoml/bentoml","events":[{"introduced":"0"},{"fixed":"009d68ea713cce4203f5ad8bb734ff55b15a2f2c"}],"database_specific":{"source":["AFFECTED_FIELD","CPE_RANGE"],"cpe":"cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.4.38"}]}}],"versions":["v1.4.36","v1.4.35","v1.4.34","v1.4.33","v1.4.32","v1.4.31","v1.4.30","v1.4.29","v1.4.28","v1.4.27","v1.4.26","v1.4.25","v1.4.24","v1.4.23","v1.4.22","v1.4.21","v1.4.20","v1.4.19","v1.4.18","v1.4.17","v1.4.16","v1.4.15","v1.4.14","v1.4.13","v1.4.12","v1.4.11","v1.4.10","v1.4.8","v1.4.7","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.4.0a2","v1.4.0a1","v1.3.22","v1.3.21","v1.3.20","v1.3.19","v1.3.18","v1.3.17","v1.3.16","v1.3.15","v1.3.14","v1.3.13","v1.3.12","v1.3.11","v1.3.10","v1.3.9","v1.3.8","v1.3.7","v1.3.6","v1.3.5","v1.3.4post1","v1.3.4","v1.1.11","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.20","v1.2.19","v1.2.18","v1.2.17","v1.2.16","v1.2.15","v1.2.14","v1.2.13","v1.2.12","v1.2.11","v1.2.10","v1.2.9","v1.2.8","v1.2.7","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1a1","v1.2.1","v1.2.0","v1.1.10","v1.1.9","v1.1.8","v1.1.7","v1.1.6","v1.1.5","v1.1.4","v1.1.3","v1.1.2","v1.1.1","v1.1.0","v1.0.25","v1.0.24","v1.0.23","v1.0.22","v1.0.21","v1.0.20","v1.0.19","v1.0.18","v1.0.17","v1.0.16","v1.0.15","v1.0.14","v1.0.13","v1.0.12","v1.0.11","v1.0.10","v1.0.9","v1.0.8","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.0","v1.0.0-rc3","v1.0.0rc2","v1.0.0-rc2","v1.0.0-rc1","v1.0.0-rc0","v1.0.0-a7","v1.0.0-a6","v1.0.0-a5","v1.0.0-a4","v1.0.0-a3","v1.0.0-a2","v1.0.0-a1","v1.0.0-dev0","v0.13.1","v0.13.0","v0.12.1","v0.12.0","v0.11.0","v0.10.1","v0.10.0","v0.9.2","v0.9.1","v0.9.0","v0.9.0.pre","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.8","v0.7.7","v0.7.5","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.3","v0.6.2","v0.6.1","v0.6.0","v0.5.8","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.9","v0.4.8","v0.4.7","v0.4.6","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.4.0","bentoml-release-v0.3.4","bentoml-release-v0.3.3","0.2.1-beta","0.2.0-beta","0.1.2-beta","0.1.1-beta","0.0.8.post1-beta","0.0.5-alpha"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35044.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}