CVE-2026-55613 - uhttpd: HTTP request smuggling via ubus POST body parse-error desync

CVE-2026-55613 - uhttpd: HTTP request smuggling via ubus POST body parse-error desync

https://cvefeed.io/rssfeed/latest.atom / Sat, 10/31/2026 - 01:27
CVE ID :CVE-2026-55613
Published : Oct. 30, 2026, 10:16 p.m. | 1 hour, 7 minutes ago
Description :uhttpd is a small HTTP server. In unpatched repository snapshots, `uh_ubus_data_send()` in `ubus.c` can desynchronize HTTP request boundaries when a `POST /ubus` JSON body arrives in multiple TCP segments. An initial segment completing a JSON object sets `du->jsobj`; a later segment takes the existing-object parse-error path and returns zero bytes consumed. The caller neither drains the remaining declared `Content-Length` nor sets `connection_close`. An HTTP request embedded in the unread body suffix is consequently processed as a new request on the same keep-alive connection. The reported reproducer returned a JSON-RPC parse error followed by a second HTTP response. This application-layer body-handler flaw is distinct from Transfer-Encoding header case handling and chunk-length state reset, and affects deployments enabling ubus, including the default OpenWrt configuration and potential proxy/CDN deployments. Repository patches 7b1bec45826bd78c8afc993435bdc0f1df2fe399 and b2285de129b9adc8b12f84f9a27c16c21f2b57a5 address this issue.
Severity: 6.9 | MEDIUM
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