Bug 2543274 (CVE-2026-102558) - CVE-2026-102558 libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth
Summary: CVE-2026-102558 libsoup: libsoup: Heap buffer overflow during WebSocket recei...
Keywords:
Status: NEW
Alias: CVE-2026-102558
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: 2543278 2543280 2543279
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-29 16:08 UTC by OSIDB Bzimport
Modified: 2026-11-02 12:47 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 02:30:16 UTC
Red Hat Product Errata RHSA-2026:83384 0 None None None 2026-10-15 02:58:57 UTC
Red Hat Product Errata RHSA-2026:83618 0 None None None 2026-10-15 15:54:04 UTC
Red Hat Product Errata RHSA-2026:84586 0 None None None 2026-10-19 04:01:59 UTC
Red Hat Product Errata RHSA-2026:92347 0 None None None 2026-10-29 11:08:31 UTC
Red Hat Product Errata RHSA-2026:93445 0 None None None 2026-11-02 02:28:35 UTC
Red Hat Product Errata RHSA-2026:93446 0 None None None 2026-11-02 03:33:57 UTC
Red Hat Product Errata RHSA-2026:93447 0 None None None 2026-11-02 02:36:01 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 03:33:51 UTC
Red Hat Product Errata RHSA-2026:93583 0 None None None 2026-11-02 08:58:20 UTC
Red Hat Product Errata RHSA-2026:93716 0 None None None 2026-11-02 12:47:01 UTC

Description OSIDB Bzimport 2026-09-29 16:08:07 UTC 
A heap buffer overflow was found in libsoup's WebSocket incoming receive buffer handling.

Incoming frames are accumulated in a GByteArray. With max-incoming-payload-size set to 0 (unlimited), a peer could declare a multi-GiB payload and stream it until the buffer length wrapped in g_byte_array_set_size() while the read still targeted the original offset, writing past the allocation.

Fixed by rejecting payload lengths above what the receive buffer can represent as soon as the frame header is parsed, before buffering the payload (commit 381a474f, libsoup 3.7.3). Such frames are closed as SOUP_WEBSOCKET_CLOSE_TOO_BIG.

References:
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/554 (Bug 6)
https://gitlab.gnome.org/GNOME/libsoup/-/commit/381a474f
Comment 1 Jon Orris 2026-10-15 02:58:56 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 15:54:03 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 04:01:58 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 11:08:31 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 02:28:34 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 02:36:00 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 03:33:50 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 03:33:56 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 08:58:19 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
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