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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

Quick assessment

Affected
openwrt luci-app-adblock-fast
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

Affected Version Matrix 1

VendorProduct Version RangeStatus
openwrt luci-app-adblock-fast < 1.2.4-2 affected
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I. Basic Information for CVE-2026-55159

Vulnerability Information

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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
Source: 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.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openwrt luci-app-adblock-fast < 1.2.4-2 -

II. Public POCs for CVE-2026-55159

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III. Intelligence Information for CVE-2026-55159

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Patches & Fixes for CVE-2026-55159 (3)

Other References for CVE-2026-55159 (1)

IV. Related Vulnerabilities

Same vendor: openwrt
Same weakness: CWE-93

V. Comments for CVE-2026-55159

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