CVE-2026-1767: Gnome Localsearch Buffer Overflow Flaw

CVE-2026-1767 Overview

CVE-2026-1767 is a heap buffer overflow vulnerability in the GNOME localsearch project, previously known as tracker-miners. The flaw resides in the MP3 extractor component tracker-extract-mp3, which parses ID3 metadata tags embedded in audio files. An incorrect length calculation during the parsing of performer tags causes a read beyond the allocated heap buffer. A remote attacker can trigger the vulnerability by delivering a specially crafted MP3 file containing malformed ID3 tags. Successful exploitation can crash the extractor process or disclose adjacent heap memory contents. The vulnerability is tracked under [CWE-805] (Buffer Access with Incorrect Length Value).

Critical Impact
A crafted MP3 file processed by tracker-extract-mp3 can trigger an out-of-bounds heap read, leading to denial of service or information disclosure on affected Linux desktops.

Affected Products

GNOME localsearch (formerly tracker-miners)
Red Hat Enterprise Linux 8, 9, and 10
Linux distributions shipping vulnerable tracker-extract-mp3 builds

Discovery Timeline

2026-06-16 - CVE-2026-1767 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-1767

Vulnerability Analysis

The tracker-extract-mp3 binary is part of GNOME localsearch, the indexing service that scans user files to populate the desktop search database. When the extractor encounters an MP3 file, it parses ID3v1 and ID3v2 metadata frames to populate fields such as title, artist, album, and performer. The parser computes the length of the performer tag from attacker-controlled values inside the ID3 frame header. The computation does not validate the resulting length against the actual allocated buffer size. When the calculated length exceeds the allocation, the parser reads past the end of the heap buffer.

The vulnerability is reachable without user interaction. The GNOME indexer automatically processes any new file added to monitored directories such as ~/Music, ~/Downloads, or removable media mount points. A file delivered through email, browser download, or a network share is sufficient to trigger extraction.

Root Cause

The root cause is an incorrect length calculation when parsing performer fields in ID3 tags. The extractor trusts size values supplied inside the MP3 metadata rather than bounding reads to the parsed buffer. This pattern matches [CWE-805], where a buffer is accessed using a length value larger than the buffer itself.

Attack Vector

The attack vector is network-adjacent in practice: any path that places a malicious MP3 file into an indexed directory is sufficient. Examples include drive-by downloads, malicious email attachments saved to disk, files synchronized through cloud storage clients, and files written to shared network volumes. No authentication beyond standard user session access is required, and no user interaction with the file itself is needed because indexing runs in the background.

The vulnerability is described in the Red Hat CVE-2026-1767 Advisory and tracked in Red Hat Bug Report #2435983.

Detection Methods for CVE-2026-1767

Indicators of Compromise

Repeated crashes or core dumps from the tracker-extract-mp3 or localsearch-extractor process recorded by systemd-coredump or abrt.
MP3 files with unusually large or malformed ID3v2 performer frames placed in user-indexed directories.
Unexpected restarts of tracker-extract-3.service or equivalent user-session units.

Detection Strategies

Monitor journalctl --user -u tracker-extract* for segmentation faults and abnormal exits tied to MP3 processing.
Hunt for newly written .mp3 files immediately preceding extractor crashes using file creation telemetry correlated with process termination events.
Scan files in indexed paths for malformed ID3 tag structures that declare frame lengths exceeding the file size.

Monitoring Recommendations

Enable systemd coredump collection on Linux endpoints and forward crash metadata to a central log platform.
Alert when tracker-extract-mp3 exits with a non-zero status more than a small threshold per hour per host.
Track inbound file delivery channels (email attachments, browser downloads, SMB writes) that introduce MP3 files into monitored directories.

How to Mitigate CVE-2026-1767

Immediate Actions Required

Apply vendor updates for localsearch or tracker-miners as soon as packages become available from your distribution.
On Red Hat Enterprise Linux 8, 9, and 10, track the Red Hat CVE-2026-1767 Advisory and install errata when released.
Inventory endpoints running GNOME desktops to identify systems exposed to automatic MP3 indexing.

Patch Information

At the time of publication, the Red Hat CVE-2026-1767 Advisory is the authoritative source for fixed package versions. Administrators should subscribe to distribution security feeds and deploy updates through standard patch management workflows once vendor builds are released.

Workarounds

Disable the MP3 extractor by removing or renaming /usr/libexec/tracker-extract-3/tracker-extract-mp3 until a patched package is installed.
Exclude untrusted directories from indexing using tracker3 config or by editing the org.freedesktop.Tracker3.Miner.Files GSettings schema to remove sensitive paths.
Stop and mask the user-level extractor service with systemctl --user mask tracker-extract-3.service on hosts that do not require desktop search.

bash

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

# Temporarily disable the MP3 extractor service for the current user
systemctl --user stop tracker-extract-3.service
systemctl --user mask tracker-extract-3.service

# Reset the indexer database after patching
tracker3 reset --filesystem --rss