---
id: "CVE-2026-125704"
page: "https://infrastack.ai/live/CVE-2026-125704"
kind: "vulnerability"
aliases: ["CVE-2026-125704"]
title: "GStreamer: crafted buffer data triggers use-after-free, possible crash"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "runtime"
products: [{"name": "gstreamer", "fixed": ["1.28.3"], "affected": "< 1.28.3", "ecosystem": "vendor"}]
ecosystems: []
tags: ["gstreamer", "media-pipelines", "network-receivers", "runtime"]
not_affected_if: ["local-media-only", "no-untrusted-input"]
published_at: "2026-11-10T11:16:43+00:00"
first_seen_at: "2026-11-10T11:21:35+00:00"
updated_at: "2026-11-10T11:22:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125704", "first_seen_at": "2026-11-10T11:21:35+00:00"}, {"source": "analyst", "url": "https://gstreamer.freedesktop.org/security/sa-2026-0028.html", "first_seen_at": "2026-11-10T11:22:40+00:00", "cites": ["https://gstreamer.freedesktop.org/security/sa-2026-0028.html"]}]
exploit_sources: []
---

# GStreamer: crafted buffer data triggers use-after-free, possible crash

Link for people: https://infrastack.ai/live/CVE-2026-125704 (this .md is for agents)

GStreamer's core buffer value deserialization frees a mapped buffer before unmapping it when serialized data contains an invalid character. An application parsing untrusted caps or structure data can crash, and a network-facing GStreamer Data Protocol receiver can be triggered without user interaction.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:gstreamer affected < 1.28.3 fixed 1.28.3

## How to check

Run 'gst-launch-1.0 --version' or 'gst-inspect-1.0 --version' (or pkg-config --modversion gstreamer-1.0); GStreamer core below 1.28.3 is affected. Also check distro packages (gstreamer1 / libgstreamer1.0) and bundled copies in apps for their backported fix status.

## Fix

Upgrade GStreamer core to 1.28.3 or later (1.28.9 is the current 1.28 stable); older versions: apply the upstream patch and recompile.

## Timeline

- 2026-11-10T11:21:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125704
- 2026-11-10T11:22:40+00:00 analyst https://gstreamer.freedesktop.org/security/sa-2026-0028.html — Matched by description to upstream GStreamer-SA-2026-0028 (core < 1.28.3, fixed 1.28.3, dated 2026-05-11); the advisory itself says no CVE assigned, so the link to this CVE id is by matching text only. No exploitation or PoC found. Web search worked; X not checked.

## Documents

- [advisory] GStreamer Security Advisory 2026-0028 https://gstreamer.freedesktop.org/security/sa-2026-0028.html

## From the sources

A use-after-free flaw was found in GStreamer core buffer value deserialization. When crafted serialized buffer data contains an invalid character, an error path frees a mapped buffer before unmapping it. An application that parses untrusted caps or structure data could crash; a network-facing GStreamer Data Protocol receiver can process such data without user interaction. Further impact has not been established.

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