CVE-2026-8023
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk48th percentile — higher than 48% of all known CVEs
Summary
A vulnerability in Zephyr's HTTP server allows reading files outside the configured root directory. An attacker can send a GET request with ../ sequences in the URL path, bypassing access restrictions for static files.
Risk Assessment
An unauthenticated remote attacker can read any readable file on the mounted volume, leading to disclosure of sensitive system or configuration data.
Recommendation
Immediately update Zephyr to a version containing the fix (above v4.4.0) or apply a patch that canonicalizes the URL path before request processing.
Original NVD description (English source)
Zephyr's HTTP server (subsys/net/lib/http) provides a static-filesystem resource type (HTTP_RESOURCE_TYPE_STATIC_FS, available when CONFIG_FILE_SYSTEM is enabled) that serves files from a configured root directory. Before this fix, both the HTTP/1 and HTTP/2 front-ends placed the raw, attacker-controlled request path into client-url_buffer (assembled in on_url() for HTTP/1 and copied verbatim from the :path pseudo-header for HTTP/2) without resolving ./.. segments. The static-FS handler then built the on-disk filename by directly concatenating the configured root with that raw URL (snprintk(fname, ..., "%s%s", static_fs_detail-fs_path, client-url_buffer) at http_server_http1.c:603 and http_server_http2.c:490) and opened it with fs_open(fname, FS_O_READ). Because the handler is reached via wildcard/leading-dir (fnmatch FNM_LEADING_DIR) or fallback resource matching, a request such as GET /<prefix/../../<file is dispatched to the handler and, after the underlying filesystem (e.g. LittleFS/FAT) resolves the .. segments, escapes the configured web root, letting an unauthenticated remote client read arbitrary readable files on the mounted volume (information disclosure). The HTTP server requires no TLS or authentication to reach this path. The fix adds http_server_remove_dot_segments(), which canonicalizes the path portion of the URL before resource lookup in both protocol handlers, neutralizing the traversal. Affects releases v4.0.0 through v4.4.0 for deployments that register a static-filesystem resource.