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CVE-2026-2923: GStreamer DVB Subtitles Out-Of-Bounds Write Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-16 · updated 2026-07-21
• Weakness: CWE-787

Description

GStreamer DVB Subtitles Out-Of-Bounds Write 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 handling of coordinates. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28838.

Affected products

• GStreamer: before 1.28.1 — fixed in 1.28.1

How to fix

Upgrade to a fixed version: GStreamer 1.28.1. Check the vendor advisory for mitigations.

References

• https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/3b8253f447bcc9831dbf643d2c69b205fedbe086
• https://www.zerodayinitiative.com/advisories/ZDI-26-161/
• https://access.redhat.com/errata/RHSA-2026:19024
• https://access.redhat.com/errata/RHSA-2026:19180
• https://access.redhat.com/errata/RHSA-2026:6259
• https://access.redhat.com/errata/RHSA-2026:6300
• https://access.redhat.com/errata/RHSA-2026:6750
• https://access.redhat.com/errata/RHSA-2026:8854
• https://access.redhat.com/errata/RHSA-2026:8862
• https://access.redhat.com/security/cve/CVE-2026-2923
• https://bugzilla.redhat.com/show_bug.cgi?id=2447503
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2923.json

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