{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55159", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-16T15:13:28.165Z", "datePublished": "2026-09-21T19:24:03.581Z", "dateUpdated": "2026-09-21T19:24:03.581Z"}, "containers": {"cna": {"title": "luci-app-adblock-fast: Delegated `luci-app-adblock-fast` users can reach root command execution by injecting newline-separated cron entries", "problemTypes": [{"descriptions": [{"cweId": "CWE-93", "lang": "en", "description": "CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/openwrt/luci/security/advisories/GHSA-ggpf-xrph-wg5v", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/openwrt/luci/security/advisories/GHSA-ggpf-xrph-wg5v"}, {"name": "https://github.com/openwrt/luci/pull/8705", "tags": ["x_refsource_MISC"], "url": "https://github.com/openwrt/luci/pull/8705"}, {"name": "https://github.com/openwrt/luci/commit/9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e", "tags": ["x_refsource_MISC"], "url": "https://github.com/openwrt/luci/commit/9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e"}, {"name": "https://github.com/openwrt/luci/commit/f67461fd0255bf992b2b559c22ec288067f2f9da", "tags": ["x_refsource_MISC"], "url": "https://github.com/openwrt/luci/commit/f67461fd0255bf992b2b559c22ec288067f2f9da"}], "affected": [{"vendor": "openwrt", "product": "luci-app-adblock-fast", "versions": [{"version": "< 1.2.4-2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-21T19:24:03.581Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-ggpf-xrph-wg5v", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "luci-app-adblock-fast", "vendor": "openwrt", "versions": [{"status": "affected", "version": "< 1.2.4-2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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", "lastModified": "2026-09-21T20:17:26.500", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-21T20:17:26.500", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/openwrt/luci/commit/9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e"}, {"source": "security-advisories@github.com", "url": "https://github.com/openwrt/luci/commit/f67461fd0255bf992b2b559c22ec288067f2f9da"}, {"source": "security-advisories@github.com", "url": "https://github.com/openwrt/luci/pull/8705"}, {"source": "security-advisories@github.com", "url": "https://github.com/openwrt/luci/security/advisories/GHSA-ggpf-xrph-wg5v"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-93"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}