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CVE-2026-55159 is a CRLF injection vulnerability in luci-app-adblock-fast versions prior to 1.2.4-2. The authenticated luci.adblock-fast.setCronEntry RPC method accepts carriage-return or line-feed characters in its entry argument and writes the value to the root crontab without enforcing a single logical line. A delegated LuCI user granted the luci-app-adblock-fast write ACL can inject an additional cron job that executes with root privileges.
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No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A CR/LF injection vulnerability in luci-app-adblock-fast for OpenWrt. Authenticated delegated users holding the component write ACL can inject an additional root crontab entry through the setCronEntry RPC method, achieving persistent command execution as UID 0.
A high-severity privilege-escalation vulnerability in OpenWrt luci-app-adblock-fast that allows delegated users to achieve root command execution via newline-separated cron entries.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.