{"id":"CVE-2025-66479","aliases":["EUVD-2025-201249","GHSA-9gqj-5w7c-vx47"],"status":"published","title":"Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing","description":"Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.","severity":{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00175,"percentile":0.07076,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-693"],"published":"2025-12-04T16:55:06Z","modified":"2026-10-28T02:30:26Z","fixes":[{"ecosystem":"npm","package":"@anthropic-ai/sandbox-runtime","fixed_in":["0.0.16"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@anthropic-ai/sandbox-runtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.16"}]}]},{"source":"osv","ecosystem":"npm","package":"@anthropic-ai/sandbox-runtime","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.16"}]}]}],"products":[{"vendor":"anthropic-experimental","product":"sandbox-runtime"}],"references":[{"url":"https://github.com/anthropic-experimental/sandbox-runtime/security/advisories/GHSA-9gqj-5w7c-vx47","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/anthropic-experimental/sandbox-runtime/commit/bea2930cc1db9c73a1b15acf6dc19c5261aec1f3","tags":["x_refsource_MISC","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66479","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9gqj-5w7c-vx47"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66479.json","tags":["advisory"]},{"url":"https://github.com/anthropic-experimental/sandbox-runtime","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-66479","title":"Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing","description":"Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.","status":"published","published":"2025-12-04T20:57:20.631Z","modified":"2025-12-05T17:04:34.471Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:32:53.157279Z"}],"euvd":[{"id":"EUVD-2025-201249","description":"Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.","status":"published","published":"2025-12-04T20:57:20Z","modified":"2025-12-05T17:04:34Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T19:49:09.437744Z"}],"ghsa":[{"id":"GHSA-9gqj-5w7c-vx47","title":"Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing ","description":"Due to a bug in sandboxing logic, `sandbox-runtime` did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16. \n\nThank you to https://github.com/bendrucker for reporting this issue!","status":"published","published":"2025-12-04T16:55:06Z","modified":"2025-12-04T22:50:13Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:39:11.110487Z"}],"nvd":[{"id":"CVE-2025-66479","description":"Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.","status":"published","published":"2025-12-04T21:16:09.393Z","modified":"2026-10-18T15:10:00.097Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:11:47.746175Z"}],"osv":[{"id":"CVE-2025-66479","title":"Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing","description":"Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.","status":"published","published":"2025-12-04T20:57:20.631Z","modified":"2026-10-28T02:30:26.474375415Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T15:44:52.202386Z"},{"id":"GHSA-9gqj-5w7c-vx47","title":"Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing ","description":"Due to a bug in sandboxing logic, `sandbox-runtime` did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16. \n\nThank you to https://github.com/bendrucker for reporting this issue!","status":"published","published":"2025-12-04T16:55:06Z","modified":"2025-12-05T12:42:56.950316Z","cvss":[{"version":"4.0","score":1.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T15:46:43.875515Z"}]}}