uhttpd is a small HTTP server.
CVE-2026-55612
uhttpd is a small HTTP server. In unpatched repository snapshots, clientpollpostdata() in client.c consumes an invalid chunk-length line, such as a size exceeding INTMAX, then clears r->contentlength and r->transferchunked without draining the remaining body or setting request.connectionclose. The completion check treats the chunked POST as finished and the keep-alive parser returns to CLIENTSTATEINIT. Attacker-controlled body bytes aligned as a complete HTTP request are then parsed and processed as another request on the same connection, causing HTTP request smuggling and request-boundary desynchronization. Commits b78f518478794e16ba3568fc1258e40bf3e8eb3b and 34460b8211d676ef1b9f40d6b775c5e112933690 patch the issue.
Assessment
- CVSS
- 3.7 (v3.1)
- Severity
- Low
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 30 October 2026
- Last updated
- 30 October 2026
- Affected
- OpenWRT
- Assigner
- GitHub_M
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
At the source
References
Query this programmatically
Agents can read this through the MCP endpoint, or over HTTP:
curl https://cve.zerocrew.in/api/cve/CVE-2026-55612