CVE-2026-1764: GNOME localsearch MP3 Parser Heap Buffer Over-Read Vulnerability

Technical summary

CVE-2026-1764 is a heap buffer over-read vulnerability in GNOME localsearch's MP3 extractor module, specifically within the `extract_performers_tags` function. The flaw stems from absent bounds checking when parsing ID3v2.4 tag structures, allowing reads past allocated buffer boundaries. The out-of-bounds read can trigger SIGSEGV crashes (denial of service) or allow an attacker to exfiltrate adjacent heap contents, which may include cached metadata or other process memory. The vulnerability is classified as CWE-125 (Out-of-bounds Read), a common precursor to both crash and information disclosure scenarios in native code.

Business impact

Affected organizations may experience intermittent indexing service failures when users interact with maliciously crafted MP3 files, degrading the user experience of the GNOME desktop search feature. More concerning, targeted file distribution could enable exfiltration of cached personal or organizational metadata resident in heap memory—including file names, keywords, or previous search terms. In shared or multi-user Linux environments (such as development workstations or thin-client deployments), this could create a localized information disclosure channel. Recovery typically requires process restart, leading to temporary loss of search functionality.

Affected systems

GNOME localsearch (formerly tracker-miners) on affected versions of Red Hat Enterprise Linux systems. The vulnerability impacts local users on systems where GNOME localsearch is installed and active. Affected versions span multiple Red Hat Enterprise Linux releases; consult the vendor advisory for specific version ranges. Systems running other desktop environments or those with localsearch disabled are not affected.

Exploitability

The attack vector is local; an attacker cannot exploit this remotely. An authenticated user or process must place a specially crafted MP3 file in a location where GNOME localsearch will index it, or coerce a user to open the file via a file manager or media application that triggers indexing. The required user interaction (UI:R) and privilege level (PR:L) limit opportunistic exploitation, but targeted scenarios—such as a compromised shared storage location or socially engineered file—remain practical. No exploit currently appears in public databases (KEV status: not added), but the vulnerability is straightforward to weaponize given knowledge of the parser flaw.

Remediation

Patch GNOME localsearch to a version that includes the bounds-checking fix in the `extract_performers_tags` function. Red Hat will release fixed packages for affected Enterprise Linux releases. Until patching is possible, organizations can mitigate exposure by disabling localsearch, restricting indexing of untrusted directories, or educating users to avoid opening MP3 files from unknown sources. Network-level controls offer limited value since the attack requires local file access.

Patch guidance

Verify the availability of patched GNOME localsearch packages from Red Hat for your specific Enterprise Linux version via your vendor's security advisory. Apply updates through your standard patch management process. Test indexing functionality after patching to confirm no regressions in search performance or metadata extraction. For systems where localsearch cannot be immediately patched, consider temporarily disabling the indexing service until updates are available.

Detection guidance

Monitor system logs for repeated localsearch process crashes (SIGSEGV signals) that correlate with MP3 file access events. Endpoint Detection and Response (EDR) tools can flag abnormal memory access patterns or crashes in the localsearch daemon. File integrity monitoring on the localsearch process binary and configuration can detect unauthorized modifications. Review user directories and shared storage for anomalous MP3 files with suspicious ID3v2.4 tag structures, though this requires specialized parsing expertise.

Why prioritize this

Although the CVSS score of 5.6 (MEDIUM) reflects the local-only attack vector and required user interaction, the combination of denial of service and information disclosure justifies prompt attention in multi-user or shared-system environments. Organizations relying on GNOME localsearch for user productivity should prioritize patching to restore service reliability. The fix is likely straightforward (bounds validation) and low-risk, making rapid deployment feasible.

Risk score, explained

The CVSS 3.1 score of 5.6 reflects: local attack vector (no remote exploitation), low complexity (no special conditions required once file is present), low privilege requirement (authenticated local user), required user interaction (file must be indexed), unchanged scope, and dual impact—low confidentiality risk (partial heap data may leak) but high availability risk (crash/DoS). The score appropriately penalizes the local-only nature while acknowledging the dual-impact threat.

Frequently asked questions