CVE-2026-55614

The record

uhttpd is a small HTTP server. In unpatched repository snapshots, `client_parse_header()` in `client.c` lowercases header names but compares the `Transfer-Encoding` value to `chunked` using case-sensitive `strcmp`. A mixed-case transfer-coding token is accepted without enabling `r->transfer_chunked`, despite transfer-coding tokens being case-insensitive. On a keep-alive connection, the `chunked` POST body is left unread and request-shaped body bytes are parsed as another HTTP request, permitting HTTP request smuggling and boundary desynchronization. Commits ae015e099986ceace44975cb69629841a2d58d37 and 6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837 patch the issue.

Affected packages

Related vulnerabilities

• CVE-2026-55613 uhttpd is a small HTTP server. CWE-444
• CVE-2026-55612 uhttpd is a small HTTP server. CWE-444
• CVE-2026-116127 Starlet versions before 0.33 for Perl send a body in responses to HEAD requests… CWE-444
• CVE-2026-91920 A flaw was found in the ChunkReader component of the Undertow web server, which is used… CWE-444
• CVE-2026-118264 Echo is a Go web framework. CWE-444
• CVE-2026-103995 Response body and chunk parsing would handle non-hex or negative integers incorrectly… CWE-444
• CVE-2026-115823 Starman versions before 0.4019 for Perl send response bodies for HEAD requests… CWE-444
• CVE-2026-115877 Twisted is an event-based framework for internet applications, supporting Python 3.6+. CWE-444