CVE-2026-55159

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Source
https://cve.org/CVERecord?id=CVE-2026-55159
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55159.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55159
Aliases
  • GHSA-ggpf-xrph-wg5v
Published
2026-09-21T19:24:03Z
Modified
2026-10-28T02:31:14Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
luci-app-adblock-fast: Delegated `luci-app-adblock-fast` users can reach root command execution by injecting newline-separated cron entries
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.

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": [
                {
                    "range": [
                        {
                            "fixed": "1.2.4-2"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                }
            ]
        },
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "fixed": "1.2.4-2"
                        },
                        {
                            "fixed": "1.2.4-2"
                        }
                    ],
                    "source": "DESCRIPTION"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/openwrt/luci

Affected ranges

Type
GIT
Repo
https://github.com/openwrt/luci
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e
Fixed
f67461fd0255bf992b2b559c22ec288067f2f9da
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "fixed": "9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "f67461fd0255bf992b2b559c22ec288067f2f9da"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55159.json"