{"id":"PYSEC-2026-3631","summary":"Keras: Lambda deserialization can bypass safe mode and execute code","details":"A vulnerability in keras-team/keras version 3.14.0 allows for arbitrary code execution due to improper handling of deserialization in the `Lambda` layer. Specifically, the `_raise_for_lambda_deserialization()` function fails to enforce the safe-mode guard when `safe_mode` is set to `None`, which is the default value when `from_config()` is called outside of a `SafeModeScope` context. This logic error conflates `None` (unset/default-deny) with `False` (explicitly disabled), bypassing the guard and allowing attacker-controlled `marshal` bytecode to be deserialized. Affected call sites include `keras.layers.deserialize(config)`, `keras.models.clone_model(model)`, and any direct invocation of `Lambda.from_config(config)` without an enclosing `SafeModeScope(True)`. This vulnerability can be exploited to achieve arbitrary OS-level code execution in the context of the server or user process.","aliases":["CVE-2026-12481","GHSA-5gwj-m78q-7pq3"],"modified":"2026-08-10T11:30:11.789165677Z","published":"2026-08-10T10:43:49.135174Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12481"},{"type":"WEB","url":"https://github.com/keras-team/keras/pull/23048"},{"type":"WEB","url":"https://github.com/keras-team/keras/pull/23165"},{"type":"WEB","url":"https://github.com/keras-team/keras/commit/55888d3becbdbb45dc16a55b489900f911e2dde5"},{"type":"WEB","url":"https://github.com/keras-team/keras/commit/d338a45204bdc787c8b3c4a9b82c1911cd52dedf"},{"type":"PACKAGE","url":"https://github.com/keras-team/keras"},{"type":"WEB","url":"https://github.com/keras-team/keras/releases/tag/v3.12.3"},{"type":"WEB","url":"https://github.com/keras-team/keras/releases/tag/v3.15.0"},{"type":"WEB","url":"https://huntr.com/bounties/59ceaed1-c8a3-4135-8f94-169ade02823d"},{"type":"PACKAGE","url":"https://pypi.org/project/keras"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-5gwj-m78q-7pq3"}],"affected":[{"package":{"name":"keras","ecosystem":"PyPI","purl":"pkg:pypi/keras"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.12.3"},{"introduced":"3.13.0"},{"fixed":"3.15.0"}]}],"versions":["0.2.0","0.3.0","0.3.1","0.3.2","0.3.3","1.0.0","1.0.1","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.1.0","1.1.1","1.1.2","1.2.0","1.2.1","1.2.2","2.0.0","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.1.1","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.10.0","2.10.0rc0","2.10.0rc1","2.11.0","2.11.0rc0","2.11.0rc1","2.11.0rc2","2.11.0rc3","2.12.0","2.12.0rc0","2.12.0rc1","2.13.1","2.13.1rc0","2.13.1rc1","2.14.0","2.14.0rc0","2.15.0","2.15.0rc0","2.15.0rc1","2.2.0","2.2.1","2.2.2","2.2.3","2.2.4","2.2.5","2.3.0","2.3.1","2.4.0","2.4.1","2.4.2","2.4.3","2.5.0rc0","2.6.0","2.6.0rc0","2.6.0rc1","2.6.0rc2","2.6.0rc3","2.7.0","2.7.0rc0","2.7.0rc2","2.8.0","2.8.0rc0","2.8.0rc1","2.9.0","2.9.0rc0","2.9.0rc1","2.9.0rc2","3.0.0","3.0.1","3.0.2","3.0.3","3.0.4","3.0.5","3.1.0","3.1.1","3.10.0","3.11.0","3.11.1","3.11.2","3.11.3","3.12.0","3.12.1","3.12.2","3.13.0","3.13.1","3.13.2","3.14.0","3.14.1","3.2.0","3.2.1","3.3.0","3.3.1","3.3.2","3.3.3","3.4.0","3.4.1","3.5.0","3.6.0","3.7.0","3.8.0","3.9.0","3.9.1","3.9.2"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/keras/PYSEC-2026-3631.yaml"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}