Bug 2489980 (CVE-2026-12151) - CVE-2026-12151 undici: undici: Denial of Service due to unbounded memory growth via WebSocket frames
Summary: CVE-2026-12151 undici: undici: Denial of Service due to unbounded memory grow...
Keywords:
Status: NEW
Alias: CVE-2026-12151
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: 2490221 2490223 2490224 2490225 2490226
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-17 17:02 UTC by OSIDB Bzimport
Modified: 2026-08-10 02:41 UTC (History)
38 users (show)

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

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:35841 0 None None None 2026-07-06 04:36:47 UTC
Red Hat Product Errata RHSA-2026:35842 0 None None None 2026-07-06 05:16:21 UTC
Red Hat Product Errata RHSA-2026:35891 0 None None None 2026-07-06 14:23:33 UTC
Red Hat Product Errata RHSA-2026:35892 0 None None None 2026-07-06 14:44:59 UTC
Red Hat Product Errata RHSA-2026:39246 0 None None None 2026-07-14 12:31:06 UTC
Red Hat Product Errata RHSA-2026:39868 0 None None None 2026-07-15 11:23:13 UTC
Red Hat Product Errata RHSA-2026:41947 0 None None None 2026-07-20 13:06:50 UTC
Red Hat Product Errata RHSA-2026:48151 0 None None None 2026-07-29 19:55:37 UTC
Red Hat Product Errata RHSA-2026:52399 0 None None None 2026-08-10 02:41:06 UTC

Description OSIDB Bzimport 2026-06-17 17:02:07 UTC 
Impact:
The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service.

Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint.

All releases starting at undici 6.17.0 are affected.

Patches: Upgrade to undici >= 6.26.0, >= 7.28.0, or >= 8.5.0. Workarounds:
No workaround is available. The fix must be applied through an upgrade.
Comment 4 errata-xmlrpc 2026-07-06 04:36:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:35841 https://access.redhat.com/errata/RHSA-2026:35841
Comment 5 errata-xmlrpc 2026-07-06 05:16:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:35842 https://access.redhat.com/errata/RHSA-2026:35842
Comment 6 errata-xmlrpc 2026-07-06 14:23:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:35891 https://access.redhat.com/errata/RHSA-2026:35891
Comment 7 errata-xmlrpc 2026-07-06 14:44:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:35892 https://access.redhat.com/errata/RHSA-2026:35892
Comment 8 errata-xmlrpc 2026-07-14 12:31:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:39246 https://access.redhat.com/errata/RHSA-2026:39246
Comment 9 errata-xmlrpc 2026-07-15 11:23:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:39868 https://access.redhat.com/errata/RHSA-2026:39868
Comment 10 errata-xmlrpc 2026-07-20 13:06:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:41947 https://access.redhat.com/errata/RHSA-2026:41947
Comment 11 errata-xmlrpc 2026-07-29 19:55:34 UTC 
This issue has been addressed in the following products:

  Cryostat 4 on RHEL 9

Via RHSA-2026:48151 https://access.redhat.com/errata/RHSA-2026:48151
Comment 14 errata-xmlrpc 2026-08-10 02:41:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:52399 https://access.redhat.com/errata/RHSA-2026:52399
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