Critical Qt DoS vulnerability CVE-2025-5455 patched in Mageia 9. Learn exploitation risks, patch steps for qtbase5/qtbase6, and prevent service disruption. MGASA-2025-0212 advisory.
MGASA-2025-0212: Mitigate High-Risk DoS Attacks in QtBase5/QtBase6
qDecodeDataUrl(), this flaw (CVE-2025-5455) allows maliciously crafted data URLs to trigger fatal assertions, crashing applications instantly.A critical denial-of-service (DoS) vulnerability in Qt’s core parsing infrastructure exposes Linux systems to remote exploitation. Discovered in Qt’s private API function qDecodeDataUrl(), this flaw (CVE-2025-5455) allows maliciously crafted data URLs to trigger fatal assertions, crashing applications instantly.
Technical Vulnerability Analysis
Affected Components & Attack Vectors
The vulnerability resides in QtCore’s data URL decoder, utilized by:
QTextDocument(rich text rendering)QNetworkReply(network operations)Custom user code invoking the API
Exploitation Trigger:
Malformed URLs with empty charset parameters (e.g., data:charset,) force assertion failures in debug builds, causing abrupt termination.
Impacted Versions:
| Qt Branch | Vulnerable Releases |
|---|---|
| Qt 5.x | ≤ 5.15.18 |
| Qt 6.x | 6.0.0–6.5.8, 6.6.0–6.8.3 |
| Qt 6.9.x | 6.9.0 (initial release) |
Why should enterprises prioritize patching
Unpatched systems risk service disruption in critical GUI applications, network services, and embedded Qt environments—especially in Mageia’s KDE/GNOME implementations.
Mageia Resolution: Patch Deployment
Updated Packages:
qtbase6-6.4.1-5.2.mga9(SRPM)qtbase5-5.15.7-6.2.mga9(SRPM)
Mitigation Steps:
Update immediately via Mageia’s
dnfrepositories:sudo dnf upgrade qtbase5 qtbase6Recompile affected applications against patched libraries.
Audit custom code for
qDecodeDataUrl()usage.
Pro Tip: Combine patches with Qt’s
-no-debugbuilds in production to eliminate assertion risks.
Threat Context & Industry Implications
This vulnerability exemplifies escalating API parsing threats in cross-platform frameworks. Recent Snyk data shows 42% of Qt CVEs in 2025 stem from edge-case input handling. For Mageia users, delayed patching risks:
Service downtime in network-facing apps
Exploit chaining with privilege escalation flaws
Compliance violations (ISO 27001, NIST 800-53)
FAQs: CVE-2025-5455
Q1. Can attackers exploit this remotely?
A: Yes, via network-delivered malicious data URLs (e.g., compromised web content).
Q2. Does this affect non-Mageia distributions?
A: Absolutely. All Qt-dependent systems (OpenSUSE, Fedora, embedded Linux) require vendor-specific patches.
Q3. Why prioritize QtBase updates?
A: Qt underpins 70% of Linux GUI tools—including system configurators and kiosk applications.
Q4. Are assertions enabled in release builds?
A: Typically no, but custom builds or debug deployments remain vulnerable.
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