7.8

CVE-2026-5056: GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability

Awaiting analysis
AliasesRHSA-2026:49508UBUNTU-CVE-2026-5056DEBIAN-CVE-2026-5056
Published 29-07-2026Last modified 30-07-2026

Vulnerability summary

CVE-2026-5056 is a high (CVSS 7.8) Stack-based Buffer Overflow vulnerability in gstreamer. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 27.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.0 (CVE.org)
EPSS score
0.34%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
USN-8285-1

Timeline

  1. 29-07-2026
    PublishedVulnerability first disclosed.
  2. 30-07-2026
    Last modifiedVulnerability information updated.

Description

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the parsing of UncompressedFrameConfigBox structures. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29392.

CVSS metrics

6 scores · 6 sources · 2 versions

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.34% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat6 products
  • gstreamer1-plugins-good< 0:1.26.7-2.el10_2.2
  • gstreamer1-plugins-good-debuginfo< 0:1.26.7-2.el10_2.2
  • gstreamer1-plugins-good-debugsource< 0:1.26.7-2.el10_2.2
  • gstreamer1-plugins-good-gtk< 0:1.26.7-2.el10_2.2
  • gstreamer1-plugins-good-gtk-debuginfo< 0:1.26.7-2.el10_2.2
Alpine1 product
  • gst-plugins-good< 1.26.3-r0
Debian1 product
  • gst-plugins-good1.0< 1.26.2-1+deb13u1 | < 1.28.2-1
Gstreamer1 product
  • gstreamera303670510771b993867ddf62bff3bce0cb988c3
Ubuntu1 product
  • gst-plugins-good1.0< 1.26.5-1ubuntu2.2

5 vendors · 10 products

References

15 links
Show all 15 references