CVE-2026-25680

A flaw was found in golang.org/x/net/html. A remote attacker could provide specially crafted HTML, which, when parsed by the affected component, would consume excessive CPU resources. This could lead to a Denial of Service (DoS) condition, making the system unavailable to legitimate users.

Red Hat rates this issue as Moderate with RH CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). A flaw was found in golang.org/x/net/html where parsing crafted HTML can consume excessive CPU time, leading to denial of service. Exploitation requires user interaction (a victim application parsing attacker-controlled HTML). Most Red Hat products that bundle golang.org/x/net do not use the html parser to process untrusted HTML in their supported execution paths.

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.

Update affected Go applications to use golang.org/x/net version 0.55.0 or later. As a workaround, do not use golang.org/x/net/html to parse untrusted HTML content, or enforce timeouts on HTML parsing operations. Applications that do not parse arbitrary HTML are not affected.