Bug 2499922 (CVE-2026-15709) - CVE-2026-15709 SoupWebsocketExtensionDeflate: libsoup: libsoup: WebSocket permessage-deflate Unbounded Decompression Remote Denial of Service
Summary: CVE-2026-15709 SoupWebsocketExtensionDeflate: libsoup: libsoup: WebSocket per...
Keywords:
Status: NEW
Alias: CVE-2026-15709
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2500488 2500490 2500489
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-14 09:43 UTC by OSIDB Bzimport
Modified: 2026-09-24 06:49 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 RHSA-2026:68234 0 None None None 2026-09-16 16:53:18 UTC
Red Hat Product Errata RHSA-2026:68235 0 None None None 2026-09-16 16:21:03 UTC
Red Hat Product Errata RHSA-2026:68612 0 None None None 2026-09-17 12:31:07 UTC
Red Hat Product Errata RHSA-2026:69108 0 None None None 2026-09-21 02:54:39 UTC
Red Hat Product Errata RHSA-2026:69297 0 None None None 2026-09-21 13:01:06 UTC
Red Hat Product Errata RHSA-2026:69863 0 None None None 2026-09-22 06:05:49 UTC
Red Hat Product Errata RHSA-2026:70598 0 None None None 2026-09-23 07:19:16 UTC
Red Hat Product Errata RHSA-2026:70599 0 None None None 2026-09-23 07:13:07 UTC
Red Hat Product Errata RHSA-2026:71389 0 None None None 2026-09-24 06:49:37 UTC

Description OSIDB Bzimport 2026-07-14 09:43:35 UTC 
A flaw in libsoup’s `permessage-deflate` WebSocket extension allows a remote attacker to cause a Denial of Service via memory exhaustion. The internal `inflate()` loop resizes its buffer dynamically without enforcing an upper limit *during* decompression. Because size checks are either performed only on the compressed wire-payload or executed too late (after inflation completes), a small decompression bomb can trigger an immediate Out-of-Memory (OOM) crash on both client and server applications.
Comment 2 Jon Orris 2026-09-16 16:21:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:68235 https://access.redhat.com/errata/RHSA-2026:68235
Comment 3 Jon Orris 2026-09-16 16:53:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:68234 https://access.redhat.com/errata/RHSA-2026:68234
Comment 4 Jon Orris 2026-09-17 12:31:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:68612 https://access.redhat.com/errata/RHSA-2026:68612
Comment 5 Jon Orris 2026-09-21 02:54:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:69108 https://access.redhat.com/errata/RHSA-2026:69108
Comment 6 Jon Orris 2026-09-21 13:01:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:69297 https://access.redhat.com/errata/RHSA-2026:69297
Comment 7 Jon Orris 2026-09-22 06:05:48 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-2026:69863 https://access.redhat.com/errata/RHSA-2026:69863
Comment 8 Jon Orris 2026-09-23 07:13:06 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-2026:70599 https://access.redhat.com/errata/RHSA-2026:70599
Comment 9 Jon Orris 2026-09-23 07:19:15 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-2026:70598 https://access.redhat.com/errata/RHSA-2026:70598
Comment 10 Jon Orris 2026-09-24 06:49:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:71389 https://access.redhat.com/errata/RHSA-2026:71389
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