CVE-2026-107928

A flaw was found in curl. When curl is built with the GnuTLS library, a blocked transmission during communication with a malicious WebSocket server can trigger an out-of-bounds memory read. A malicious server can exploit this flaw to expose sensitive data from neighboring memory buffers or crash the client, leading to information disclosure or a Denial of Service (DoS).

This vulnerability is rated as Low impact because exploitation is constrained to curl builds utilizing the GnuTLS backend connecting to an untrusted WebSocket server, with consequences limited to an application crash or minor memory exposure. Standard curl deployments in Red Hat products typically use alternative TLS libraries such as OpenSSL, significantly reducing exposure. Furthermore, triggering this behavior requires a specific I/O blocking condition during WebSocket communication, making successful exploitation difficult to achieve in practice.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.