Privilege escalation to the `CAP_NET_RAW` capability via the `programs.captive-browser` NixOS module

{
  "id": "840268e05d31f57d8ff04d42c5bd82b3471d4e3e4658bd1ac8987179c73764b1",
  "url": "https://osv.dev/vulnerability/CVE-2026-25740",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Privilege escalation to the `CAP_NET_RAW` capability via the `programs.captive-browser` NixOS module",
    "summary": "captive browser, a dedicated Chrome instance to log into captive portals without messing with DNS settings. In 25.05 and earlier, when programs.captive-browser is enabled, any user of the system can run arbitrary commands with the CAP_NET_RAW capability (binding to privileged ports, spoofing localhost traffic from privileged services...). This vulnerability is fixed in 25.11 and 26.05.",
    "evidence": "osv:CVE-2026-25740",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-25740",
      "aliases": [
        "CVE-2026-25740",
        "GHSA-wc3r-c66x-8xmc"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nixos/nixpkgs",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e56e0beed4312a89b60fe312ee2241f7a1627f76"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "25.11"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "25.05"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "24.11-pre",
            "24.05-pre",
            "23.11-beta",
            "23.11-pre",
            "23.05-pre",
            "21.11-pre",
            "18.09-beta",
            "18.03-beta",
            "v208",
            "v206",
            "v192",
            "15.09-beta",
            "0.14",
            "0.13",
            "0.4",
            "0.3",
            "0.2",
            "0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25740.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.725177110Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25740.json",
        "https://github.com/NixOS/nixpkgs/security/advisories/GHSA-wc3r-c66x-8xmc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25740",
        "https://github.com/NixOS/nixpkgs/pull/487775",
        "https://github.com/NixOS/nixpkgs/pull/487779"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-250"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25740.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25740",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490874,
  "published_at": "2026-02-09T20:17:16.777+00:00"
}