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CVE-2026-55612 is a high-severity HTTP request smuggling vulnerability in OpenWrt's uhttpd web server. The flaw affects request processing on keep-alive connections and is caused by an invalid reset of parser state related to chunk-length handling during HTTP message framing. This can cause uhttpd to misinterpret request boundaries when processing chunked request bodies, leading to front-end/back-end desynchronization conditions. In deployments where uhttpd is reachable by an attacker, a crafted sequence of HTTP requests can be used to smuggle a second request across a persistent connection and have it processed out of sync with the visible request stream.
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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 high-severity HTTP request smuggling vulnerability in OpenWrt uhttpd caused by invalid chunk-length state reset on keep-alive connections.
A high-severity HTTP request smuggling vulnerability in uhttpd caused by invalid chunk-length state reset.
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.
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