CVE-2026-55614

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    CVE-2026-55614

    Published: 30 Oct 2026Last Modified: 8 Nov 2026

    Summary: uhttpd vulnerable to HTTP request smuggling via case-sensitive Transfer-Encoding matching

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55614.json, https://github.com/openwrt/uhttpd/security/advisories/GHSA-mcfg-c4r7-pjpf, https://nvd.nist.gov/vuln/detail/CVE-2026-55614, https://github.com/openwrt/uhttpd/commit/6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837, https://github.com/openwrt/uhttpd/commit/ae015e099986ceace44975cb69629841a2d58d37

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 2bef561c890f275ce3b785e6abdb3eda28c96aa8
    Fixed -ae015e099986ceace44975cb69629841a2d58d37

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-55614 | CVE-DB