CVE-2025-12385
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAllocation of Resources Without Limits or Throttling, Improper Validation of Specified Quantity in Input vulnerability in The Qt Company Qt on Windows, MacOS, Linux, iOS, Android, x86, ARM, 64 bit, 32 bit allows Excessive Allocation. This issue affects users of the Text component in Qt Quick. Missing validation of the width and height in the <img> tag could cause an application to become unresponsive. This issue affects Qt: from 5.0.0 through 6.5.10, from 6.6.0 through 6.8.5, from 6.9.0 through 6.10.0.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThis is a resource exhaustion vulnerability in Qt's Text component within Qt Quick. The <img> tag handler fails to validate width and height parameters before allocating memory, allowing attackers to trigger excessive memory allocation by specifying very large dimensions. This can cause applications to become unresponsive or crash due to resource exhaustion.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Qt versionRun 'qmake --version' or check the Qt DLL/file version properties. Also check any build configuration files or dependency lists for the Qt version string.Affected if The Qt version is older than 6.5.11, 6.8.6, or 6.10.1 (whichever branch is in use)
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Verify Qt Quick usageReview application source code for imports of QtQuick (import QtQuick) or check for .qml files that use Qt Quick components.Affected if The application uses Qt Quick (Qt QML) for its UI rendering
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Identify img tag usage in Text elementsSearch source code for <img> tags within Text components, such as 'Text { text: "<img src=...>" }' or any dynamic HTML/image content rendered in Qt Quick Text elements.Affected if The application renders <img> tags in Qt Quick Text elements with potentially user-controlled source attributes
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Check for input validation on image dimensionsReview code that sets text content containing img tags, looking for any explicit width/height validation or sanitization before passing to the Text component.Affected if No bounds checking exists on width/height attributes in img tags before rendering, and users can control these values
A system is affected if it runs a vulnerable Qt version (< 6.5.11/6.8.6/6.10.1) AND uses Qt Quick Text elements that render <img> tags with user-influenced dimension parameters.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpdate Qt to version 6.5.11+, 6.8.6+, or 6.10.1+ which contain bounds checking for image dimensions in the Text component. Alternatively, sanitize or limit image dimension inputs in Qt Quick Text elements before rendering.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-12385 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-12385 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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