Bug 2486733 (CVE-2026-52722)

Summary:	CVE-2026-52722 gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload handling
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, security-response-team, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A signed integer overflow vulnerability was found in GStreamer's VMnc decoder. A crafted VMnc stream with large cursor dimensions can overflow signed integer payload-size arithmetic, bypassing a length check and leading to out-of-bounds reads. A remote attacker could trick a user into opening a specially crafted VMnc file, potentially causing a crash or information disclosure.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-06-09 07:37:00 UTC

GStreamer VMnc decoder signed integer overflow vulnerability. In vmncdec.c (gst-plugins-bad), at line 408, the cursor payload size computation datalen += rect->width * rect->height * dec->format.bytes_per_pixel * 2 uses signed 32-bit arithmetic. A crafted VMnc stream with large cursor dimensions (e.g., 65535 x 65535) overflows the signed multiplication to a negative value, causing datalen to become small or negative. The check if (len < datalen) then passes, g_malloc(size) allocates a tiny buffer, but the rendering loop in render_colour_cursor() uses the original large width/height values (dec->cursor.width = 65535) to iterate, reading far beyond the tiny allocated buffer into adjacent heap memory. Upstream confirmed by maintainer Sebastian Dröge (2026-06-02): "Confirmed, integer overflow that leads to OOB reads. Can lead to crashes or possibly information disclosure, and can be triggered from specially crafted files." Fix planned for GStreamer 1.28.4. Upstream issue: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5107 (confidential). Reported via PSIRTSUPT-17026 by JUNYI LIU / Moss (moss80199).

Comment 1 errata-xmlrpc 2026-07-08 13:56:27 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:36749 https://access.redhat.com/errata/RHSA-2026:36749

Comment 2 errata-xmlrpc 2026-07-08 20:27:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:36834 https://access.redhat.com/errata/RHSA-2026:36834

Comment 3 errata-xmlrpc 2026-07-09 07:41:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:37130 https://access.redhat.com/errata/RHSA-2026:37130

Comment 4 errata-xmlrpc 2026-07-28 12:41:59 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-2026:47076 https://access.redhat.com/errata/RHSA-2026:47076

Comment 5 errata-xmlrpc 2026-07-28 12:57:43 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-2026:47075 https://access.redhat.com/errata/RHSA-2026:47075

Comment 6 errata-xmlrpc 2026-07-28 15:12:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:47069 https://access.redhat.com/errata/RHSA-2026:47069

Comment 7 errata-xmlrpc 2026-07-28 16:09:13 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:47070 https://access.redhat.com/errata/RHSA-2026:47070

Comment 8 errata-xmlrpc 2026-07-28 16:15:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:47071 https://access.redhat.com/errata/RHSA-2026:47071

Comment 9 errata-xmlrpc 2026-07-28 18:29:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:47176 https://access.redhat.com/errata/RHSA-2026:47176

Comment 10 errata-xmlrpc 2026-07-29 06:25:00 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-2026:47718 https://access.redhat.com/errata/RHSA-2026:47718

Comment 11 errata-xmlrpc 2026-07-29 19:46:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:47717 https://access.redhat.com/errata/RHSA-2026:47717

Comment 12 errata-xmlrpc 2026-08-03 04:17:12 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:49517 https://access.redhat.com/errata/RHSA-2026:49517