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CVE-2026-55159— luci-app-adblock-fast: Delegated `luci-app-adblock-fast` users can reach root command execution by injecting newline-separated cron entries

一分钟漏洞结论

影响对象
openwrt luci-app-adblock-fast
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

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-fee

CVSS 8.8 · High EPSS 0.49% · P41

影响版本矩阵 1

厂商产品 版本范围状态
openwrt luci-app-adblock-fast < 1.2.4-2 affected
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一、 漏洞 CVE-2026-55159 基础信息

漏洞信息

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Vulnerability Title
luci-app-adblock-fast: Delegated `luci-app-adblock-fast` users can reach root command execution by injecting newline-separated cron entries
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
openwrt luci-app-adblock-fast < 1.2.4-2 -

二、漏洞 CVE-2026-55159 的公开POC

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三、漏洞 CVE-2026-55159 的情报信息

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CVE-2026-55159 补丁与修复 (3)

CVE-2026-55159 其他参考 (1)

IV. Related Vulnerabilities

Same vendor: openwrt
Same weakness: CWE-93

V. Comments for CVE-2026-55159

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