CVE-2025-10016 Overview
CVE-2025-10016 is a local privilege escalation vulnerability in the Sparkle software update framework for macOS. The flaw resides in the Autoupdate helper tool, which fails to authenticate connecting clients. A local unprivileged attacker can race to connect to the daemon when another application spawns it as root and request installation of a crafted malicious PKG file. Successful exploitation yields root privileges on the affected system. The issue is tracked under CWE-863: Incorrect Authorization and was fixed in Sparkle version 2.7.2.
Critical Impact
Local unprivileged attackers can escalate to root by winning a race against legitimate application update flows that spawn Sparkle's Autoupdate helper.
Affected Products
- Sparkle framework versions prior to 2.7.2
- macOS applications bundling vulnerable Sparkle releases for auto-update functionality
- Third-party software distributions relying on the Sparkle Autoupdate helper tool
Discovery Timeline
- 2025-09-16 - CVE-2025-10016 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-10016
Vulnerability Analysis
Sparkle is a widely deployed update framework for macOS applications. To install privileged updates, Sparkle ships an Autoupdate helper tool that runs as root when an application requests an update installation. The helper exposes an inter-process communication channel used by the parent application to request installation of a PKG file.
The helper does not authenticate connecting clients. Any local process can connect to the daemon while it is running and issue installation requests. Because the helper executes as root, an installation request for an attacker-controlled PKG results in code execution with root privileges. This maps to CWE-863: Incorrect Authorization.
Root Cause
The root cause is missing client authentication on the Autoupdate IPC endpoint. The helper trusts any local caller that reaches the socket during the window in which the legitimate parent application has spawned it. There is no verification that the connecting process is the code-signed parent that originally requested the update.
Attack Vector
Exploitation requires local access with unprivileged user rights. The attacker monitors for an application spawning Autoupdate as root and races to connect to the helper before the legitimate parent completes its request. Once connected, the attacker submits a crafted malicious PKG and the helper installs it with root privileges.
An alternative path spawns Autoupdate manually through the Installer XPC service. This path requires the victim to approve a system authorization dialog, and the attacker can modify the prompt text to mislead the user into granting credentials. See the CERT.PL advisory and the Sparkle project discussion #2764 for additional technical detail.
Detection Methods for CVE-2025-10016
Indicators of Compromise
- Unexpected execution of the Sparkle Autoupdate helper by processes other than a code-signed parent application.
- Installation of PKG files from paths under user-writable directories such as /tmp, /var/folders, or $HOME/Library/Caches immediately after Autoupdate invocation.
- New root-owned launch agents, launch daemons, or binaries created in /Library/LaunchDaemons or /usr/local/bin shortly after an update event.
Detection Strategies
- Monitor process telemetry for local processes connecting to the Autoupdate IPC endpoint that are not the expected code-signed parent bundle.
- Correlate installer command invocations executing PKG payloads with the initiating parent process and PKG signature status.
- Alert on PKG installations that occur without a corresponding user-initiated update dialog in application logs.
Monitoring Recommendations
- Track versions of the Sparkle framework embedded in installed applications and flag versions earlier than 2.7.2.
- Ingest macOS Endpoint Security telemetry into a centralized data lake to enable retroactive hunting for suspicious Autoupdate activity.
- Review system authorization prompts and audit logs for unexpected privilege elevation requests originating from update helpers.
How to Mitigate CVE-2025-10016
Immediate Actions Required
- Inventory macOS applications that bundle the Sparkle framework and identify any using versions earlier than 2.7.2.
- Update affected applications to releases that ship Sparkle 2.7.2 or later.
- Restrict local access on shared macOS systems and remove unnecessary standard user accounts on high-value endpoints.
- Educate users to scrutinize macOS authorization dialogs and reject unexpected credential prompts triggered by update flows.
Patch Information
The Sparkle maintainers fixed the authorization flaw in Sparkle 2.7.2. Application vendors must rebuild and redistribute their software with the patched framework. Consult the Sparkle project repository for release details and integration guidance.
Workarounds
- Disable auto-update functionality in applications that cannot be immediately updated to a Sparkle 2.7.2-based release.
- Limit interactive logins on multi-user macOS systems to reduce exposure to local attackers.
- Where feasible, apply application allowlisting to prevent execution of unsigned or unexpected PKG payloads through the installer binary.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
