CVE-2026-1765: GNOME Localsearch Buffer Overflow Flaw

CVE-2026-1765 Overview

CVE-2026-1765 is a heap buffer overflow vulnerability in the tracker-extract-mp3 component of GNOME localsearch, previously known as tracker-miners. The flaw occurs when the component parses specially crafted MP3 files during metadata extraction. An attacker who places a malicious MP3 file on a target system can trigger an out-of-bounds read [CWE-125], crashing the extractor process. The same condition may expose adjacent heap memory contents to the attacker. Exploitation requires local access and user interaction, since the file must be processed by the indexer. The issue is tracked under Red Hat CVE-2026-1765 Advisory.

Critical Impact
A crafted MP3 file processed by GNOME localsearch can crash tracker-extract-mp3 and potentially leak heap memory contents to a local attacker.

Affected Products

GNOME localsearch (formerly tracker-miners) — tracker-extract-mp3 component
Linux distributions shipping GNOME localsearch with desktop indexing enabled
Red Hat ecosystem products referencing this CVE in the Red Hat advisory

Discovery Timeline

2026-06-16 - CVE-2026-1765 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-1765

Vulnerability Analysis

The vulnerability resides in tracker-extract-mp3, the helper that parses MP3 audio metadata for the GNOME localsearch indexing service. When the parser reads malformed length fields or tag structures in an MP3 file, it accesses memory outside the bounds of an allocated heap buffer. This out-of-bounds read [CWE-125] manifests as a heap buffer overflow during extraction. The immediate effect is a process crash, producing a denial of service for the indexer. Because the read can traverse adjacent heap regions, fragments of process memory may be incorporated into extracted metadata and surface to the local user context. The flaw affects confidentiality and availability while leaving integrity untouched, consistent with a read-only memory safety bug.

Root Cause

The defect stems from insufficient validation of size or offset fields parsed from untrusted MP3 tag structures. The parser trusts attacker-controlled length values when computing read offsets, allowing the extractor to step past the end of a heap allocation. Details are tracked in Red Hat Bug Report #2435981.

Attack Vector

The attack requires local presence of a malicious MP3 file. GNOME localsearch automatically indexes files in user-monitored directories such as the home folder, Downloads, or removable media. An attacker who drops a crafted MP3 into a monitored path triggers tracker-extract-mp3 without further user action beyond mounting or saving the file. Privileges required are limited to those of the indexing user account.

No verified public proof-of-concept code is available. The vulnerability mechanism is described in prose based on the upstream advisory references.

Detection Methods for CVE-2026-1765

Indicators of Compromise

Repeated crashes of the tracker-extract-mp3 or tracker-extract process logged by systemd --user or in journalctl --user.
Core dumps attributed to tracker extractor binaries shortly after new MP3 files appear in indexed directories.
Unexpected MP3 files in user directories with malformed ID3 tag structures or abnormal frame sizes.

Detection Strategies

Monitor process exit codes and segmentation faults for tracker extractor child processes.
Inspect newly written MP3 files in indexed paths using a metadata validator to flag oversized or malformed tag fields.
Correlate file write events from untrusted sources, such as USB media or downloads, with subsequent extractor crashes.

Monitoring Recommendations

Forward journalctl --user logs and core dump metadata to a centralized log platform for analysis.
Track baseline crash rates of GNOME localsearch components and alert on deviations.
Audit which user accounts have indexing enabled on shared or multi-tenant workstations.

How to Mitigate CVE-2026-1765

Immediate Actions Required

Apply distribution updates for localsearch or tracker-miners as soon as packages referencing CVE-2026-1765 become available.
Restrict the directories monitored by GNOME localsearch on systems that handle untrusted media.
Remove or quarantine MP3 files received from untrusted sources until the host is patched.

Patch Information

No fixed version was published in the NVD record at the time of writing. Consult the Red Hat CVE-2026-1765 Advisory and your distribution's security tracker for package updates addressing the tracker-extract-mp3 heap buffer overflow.

Workarounds

Disable the MP3 extractor or the localsearch indexing service using systemctl --user mask tracker-extract-3.service until a patched build is installed.
Reduce the set of indexed locations in GNOME Search settings to exclude directories that receive untrusted files.
Use file integrity controls to block execution of indexers on removable media mount points.

bash

# Disable the GNOME localsearch extractor service for the current user
systemctl --user mask tracker-extract-3.service
systemctl --user stop tracker-extract-3.service

# Limit indexed directories via gsettings
gsettings set org.freedesktop.Tracker3.Miner.Files index-recursive-directories "[]"
gsettings set org.freedesktop.Tracker3.Miner.Files index-single-directories "[]"