{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e"
            },
            {
              "fixed": "f67461fd0255bf992b2b559c22ec288067f2f9da"
            }
          ],
          "repo": "https://github.com/openwrt/luci",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-ggpf-xrph-wg5v"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-93"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55159.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "1.2.4-2"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "luci-app-adblock-fast a WebUI for fast, lightweight DNS-based ad-blocker for OpenWrt that works with dnsmasq, smartdns, or unbound. Prior to 1.2.4-2, the luci.adblock-fast.setCronEntry RPC method accepts an entry argument containing carriage-return or line-feed characters and serializes it into /etc/crontabs/root as though it were one logical line. An authenticated delegated user with the luci-app-adblock-fast write ACL can therefore create an additional physical root cron entry through applications/luci-app-adblock-fast/root/usr/share/rpcd/ucode/luci.adblock-fast, resulting in persistent command execution as UID 0 when cron runs. The issue is not demonstrated for unauthenticated callers or users without the component write ACL. This vulnerability is fixed in 1.2.4-2.",
  "id": "CVE-2026-55159",
  "modified": "2026-09-26T03:30:18.725144581Z",
  "published": "2026-09-21T19:24:03.581Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55159.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/openwrt/luci/security/advisories/GHSA-ggpf-xrph-wg5v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55159"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openwrt/luci/commit/9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openwrt/luci/commit/f67461fd0255bf992b2b559c22ec288067f2f9da"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openwrt/luci/pull/8705"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "luci-app-adblock-fast: Delegated `luci-app-adblock-fast` users can reach root command execution by injecting newline-separated cron entries"
}