Is CVE-2026-12891 actively exploited?

No active exploitation of CVE-2026-12891 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-12891 be exploited remotely?

Yes. CVE-2026-12891 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-12891?

CVE-2026-12891 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-12891

CWE-125Published: June 23, 2026· Updated: Jun 25, 2026

4.3

CVSS v3.1

EPSS:0.27%probability of exploitation in 30 daysPercentile:17.7th

Official Description

A flaw was found in the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.

NVD Source

Technical Analysis

CVE-2026-12891 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.