CVE-2026-118664
decode-uri-component: decode-uri-component: Denial of Service via malformed percent-encoded input
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 29, 2026
Updated · November 4, 2026
Description
A flaw was found in decode-uri-component. A remote attacker can trigger a Denial of Service (DoS) by sending crafted input containing numerous malformed percent-encoded sequences. When processing this input, an inefficient fallback decoding routine consumes excessive processor resources and blocks the application event loop. This prevents the application from handling incoming traffic, rendering the service unresponsive to all users.
CVSS score applicability
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.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1322 · Use of Blocking Code in Single-threaded, Non-blocking Context