Bug 2543231 (CVE-2026-102557) - CVE-2026-102557 libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly
Summary: CVE-2026-102557 libsoup: libsoup: Heap buffer overflow during WebSocket messa...
Keywords:
Status: NEW
Alias: CVE-2026-102557
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: 2543251 2543252 2543248 2543282
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-29 15:08 UTC by OSIDB Bzimport
Modified: 2026-11-11 11:50 UTC (History)
2 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 RHBA-2026:87453 0 None None None 2026-10-22 02:30:14 UTC
Red Hat Product Errata RHSA-2026:83384 0 None None None 2026-10-15 02:58:55 UTC
Red Hat Product Errata RHSA-2026:83618 0 None None None 2026-10-15 15:54:07 UTC
Red Hat Product Errata RHSA-2026:84586 0 None None None 2026-10-19 04:01:58 UTC
Red Hat Product Errata RHSA-2026:92347 0 None None None 2026-10-29 11:08:30 UTC
Red Hat Product Errata RHSA-2026:93445 0 None None None 2026-11-02 02:28:32 UTC
Red Hat Product Errata RHSA-2026:93446 0 None None None 2026-11-02 03:33:56 UTC
Red Hat Product Errata RHSA-2026:93447 0 None None None 2026-11-02 02:36:00 UTC
Red Hat Product Errata RHSA-2026:93465 0 None None None 2026-11-02 03:31:01 UTC
Red Hat Product Errata RHSA-2026:93466 0 None None None 2026-11-02 03:33:50 UTC
Red Hat Product Errata RHSA-2026:93583 0 None None None 2026-11-02 08:58:19 UTC
Red Hat Product Errata RHSA-2026:93716 0 None None None 2026-11-02 12:47:00 UTC
Red Hat Product Errata RHSA-2026:98453 0 None None None 2026-11-11 11:50:56 UTC
Red Hat Product Errata RHSA-2026:98560 0 None None None 2026-11-11 11:19:24 UTC

Description OSIDB Bzimport 2026-09-29 15:08:12 UTC 
A heap buffer overflow was found in libsoup WebSocket fragmented-message reassembly.

Reassembled messages are stored in a GByteArray (length typed as guint). A sequence of fragments (or extension expansion) that grew the message past G_MAXINT caused g_byte_array_set_size() / related growth APIs to truncate the size while surrounding code continued to use the full length, corrupting the heap. Upstream notes interaction with older GLib (e.g. 2.70) growth behavior.

Fixed by rejecting reassembly that would exceed what a GByteArray can safely hold, independently of max-total-message-size (commit d7f074f8, libsoup 3.7.3).

References:
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/554 (Bug 5)
https://gitlab.gnome.org/GNOME/libsoup/-/commit/d7f074f8
Comment 1 Jon Orris 2026-10-15 02:58:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:83384 https://access.redhat.com/errata/RHSA-2026:83384
Comment 2 Jon Orris 2026-10-15 15:54:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:83618 https://access.redhat.com/errata/RHSA-2026:83618
Comment 3 Jon Orris 2026-10-19 04:01:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:84586 https://access.redhat.com/errata/RHSA-2026:84586
Comment 4 Jon Orris 2026-10-29 11:08:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:92347 https://access.redhat.com/errata/RHSA-2026:92347
Comment 5 Jon Orris 2026-11-02 02:28:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:93445 https://access.redhat.com/errata/RHSA-2026:93445
Comment 6 Jon Orris 2026-11-02 02:35:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:93447 https://access.redhat.com/errata/RHSA-2026:93447
Comment 7 Jon Orris 2026-11-02 03:31:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:93465 https://access.redhat.com/errata/RHSA-2026:93465
Comment 8 Jon Orris 2026-11-02 03:33:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:93466 https://access.redhat.com/errata/RHSA-2026:93466
Comment 9 Jon Orris 2026-11-02 03:33:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:93446 https://access.redhat.com/errata/RHSA-2026:93446
Comment 10 Jon Orris 2026-11-02 08:58:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:93583 https://access.redhat.com/errata/RHSA-2026:93583
Comment 11 Jon Orris 2026-11-02 12:47:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:93716 https://access.redhat.com/errata/RHSA-2026:93716
Comment 12 errata-xmlrpc 2026-11-11 11:19:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:98560 https://access.redhat.com/errata/RHSA-2026:98560
Comment 13 errata-xmlrpc 2026-11-11 11:50:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:98453 https://access.redhat.com/errata/RHSA-2026:98453
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