CVE-2026-1766: Gnome Localsearch DoS Vulnerability

CVE-2026-1766 Overview

CVE-2026-1766 is a heap buffer overflow vulnerability in GNOME localsearch (formerly known as tracker-miners), specifically affecting the tracker-extract-mp3 component. The flaw triggers when the MP3 extractor parses malformed ID3v2.3 COMM (Comment) tags inside a crafted MP3 file. A local attacker who convinces a user to open or index a malicious MP3 can crash the extractor process and potentially read adjacent heap memory.

Critical Impact
Local attackers can trigger a denial of service in the GNOME file indexer and may disclose sensitive heap memory contents by supplying a crafted MP3 file with malformed ID3v2.3 COMM tags.

Affected Products

GNOME localsearch (formerly tracker-miners)
Red Hat Enterprise Linux 8, 9, and 10
Systems using tracker-extract-mp3 for media indexing

Discovery Timeline

2026-06-16 - CVE-2026-1766 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-1766

Vulnerability Analysis

The vulnerability resides in tracker-extract-mp3, the MP3 metadata extractor shipped with GNOME localsearch. The extractor parses ID3v2.3 metadata frames embedded in MP3 files so the desktop indexer can populate searchable attributes such as title, artist, and comments. When the extractor processes a COMM (Comment) frame, it fails to correctly validate the frame size against the destination buffer on the heap.

This condition is classified under [CWE-805] (Buffer Access with Incorrect Length Value). A specially crafted COMM tag instructs the parser to read or write outside the bounds of the allocated heap buffer. The result is an out-of-bounds memory access that crashes the extractor process and can leak adjacent heap data to the attacker.

Because tracker-extract-mp3 runs automatically whenever the GNOME desktop discovers new media files, no explicit user action beyond placing a file in an indexed directory is required for the parser to process it. The attack vector remains local and requires user interaction to deliver the file, but exploitation does not require authentication.

Root Cause

The root cause is improper length validation when copying data from an ID3v2.3 COMM frame into a heap-allocated buffer inside tracker-extract-mp3. The frame size declared in the MP3 header is trusted without sufficient bounds checking, allowing a malformed COMM tag to drive a heap buffer overflow.

Attack Vector

An attacker crafts an MP3 file containing a malformed ID3v2.3 COMM tag. The attacker delivers the file through email, a USB drive, a shared folder, or a web download. When the file lands in a directory monitored by GNOME localsearch, tracker-extract-mp3 parses it automatically and triggers the overflow. The outcome is an extractor crash, denial of service for media indexing, and potential disclosure of heap memory contents.

No public proof-of-concept exploit is currently listed for CVE-2026-1766. See the Red Hat CVE-2026-1766 Advisory and Red Hat Bug Report #2435982 for vendor technical details.

Detection Methods for CVE-2026-1766

Indicators of Compromise

Repeated crashes or segmentation faults in the tracker-extract-mp3 process recorded in systemd-coredump or journal logs.
MP3 files with abnormally sized or malformed ID3v2.3 COMM frames present in user-accessible directories.
Unexpected restarts of tracker-extract-3 or localsearch-3 services after media files appear on disk.

Detection Strategies

Monitor process exit codes and core dumps for tracker-extract-mp3 and correlate with recently added MP3 files.
Scan inbound MP3 files at email and file-sharing gateways for malformed ID3v2.3 headers using metadata validation tools.
Alert on heap corruption signatures reported by glibc (for example, malloc_printerr aborts) tied to the tracker extractor binary.

Monitoring Recommendations

Enable verbose logging for tracker-extract and forward journald events to a centralized log platform.
Track creation of MP3 files in user home directories and removable media mount points indexed by localsearch.
Review crash telemetry on RHEL 8, 9, and 10 endpoints for spikes correlated with media file ingestion.

How to Mitigate CVE-2026-1766

Immediate Actions Required

Apply the GNOME localsearch security update for your distribution as soon as it is published by the vendor.
On Red Hat Enterprise Linux 8, 9, and 10, monitor the Red Hat CVE-2026-1766 Advisory and install the corresponding tracker-miners or localsearch errata.
Restrict indexing of untrusted directories until patches are deployed across affected hosts.

Patch Information

Refer to the Red Hat CVE-2026-1766 Advisory and Red Hat Bug Report #2435982 for the current patch state. Upstream GNOME localsearch fixes will be delivered through the tracker-miners / localsearch package channels for each supported distribution.

Workarounds

Disable the MP3 extractor by removing or renaming tracker-extract-mp3 rules in /usr/share/tracker3-miners/extract-rules/ until a patch is applied.
Pause or disable the file indexer with tracker3 daemon -t and exclude untrusted directories via org.freedesktop.Tracker3.Miner.Files settings.
Avoid opening or copying MP3 files from untrusted sources into indexed locations such as ~/Music or ~/Downloads.

bash

# Configuration example: exclude untrusted directories from indexing
gsettings set org.freedesktop.Tracker3.Miner.Files index-recursive-directories "[]"
gsettings set org.freedesktop.Tracker3.Miner.Files index-single-directories "[]"

# Stop and reset the tracker daemons until patches are installed
tracker3 daemon -t
tracker3 reset --filesystem