Bug 2498128 (CVE-2026-59724) - CVE-2026-59724 engine.io: Engine.IO: Denial of Service via crafted WebTransport session ID
Summary: CVE-2026-59724 engine.io: Engine.IO: Denial of Service via crafted WebTranspo...
Keywords:
Status: NEW
Alias: CVE-2026-59724
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 16:02 UTC by OSIDB Bzimport
Modified: 2026-07-10 10:20 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-07-08 16:02:20 UTC 
Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7.
Note You need to log in before you can comment on or make changes to this bug.