{"affected":[{"product":"uhttpd","source":"CNA: GitHub_M","vendor":"openwrt","versions":[{"status":"affected","version":"< 7b1bec45826bd78c8afc993435bdc0f1df2fe399"}]}],"cveId":"CVE-2026-55613","cwes":["CWE-444"],"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.","epss":{"date":"2026-11-04","percentile":0.33888,"score":0.00395},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/openwrt/uhttpd/security/advisories/GHSA-wgwp-64hh-f52p"}],"kev":null,"metrics":[{"score":6.9,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},{"score":6.9,"severity":"medium","source":"NVD: security-advisories@github.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"}],"modifiedAt":1793847337771,"publishedAt":1793397439199,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/openwrt/uhttpd/security/advisories/GHSA-wgwp-64hh-f52p"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/openwrt/uhttpd/commit/7b1bec45826bd78c8afc993435bdc0f1df2fe399"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/openwrt/uhttpd/commit/b2285de129b9adc8b12f84f9a27c16c21f2b57a5"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/openwrt/uhttpd/security/advisories/GHSA-wgwp-64hh-f52p"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/openwrt/uhttpd/commit/7b1bec45826bd78c8afc993435bdc0f1df2fe399"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/openwrt/uhttpd/commit/b2285de129b9adc8b12f84f9a27c16c21f2b57a5"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/openwrt/uhttpd/security/advisories/GHSA-wgwp-64hh-f52p"}],"remediation":[],"revision":"f7cce7f15eea6618c4d073d741f1a480617cb55a0356ac55c7ba6f668415d21a","sources":[{"modifiedAt":1793847337771,"name":"CNA: GitHub_M","retrievedAt":1793848246456,"url":"https://www.cve.org/CVERecord?id=CVE-2026-55613"},{"modifiedAt":1793648133347,"name":"NVD","retrievedAt":1793665711901,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55613"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793848265296,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-55613"}],"ssvc":{"assessedAt":1793847316426,"automatable":"yes","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"uhttpd: HTTP request smuggling via ubus POST body parse-error desync","updatedAt":1793848265296}