CVE-2026-46601
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 · uneditedThe webp decoder can panic when processing a VP8 chunk with dimensions that do not match the canvas size.
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 · moderate confidenceThe WebP decoder lacks proper validation of VP8 chunk dimensions against the canvas size, allowing a specially crafted WebP file with mismatched dimensions to trigger a panic (crash). This results in a denial-of-service condition when processing malicious WebP images.
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
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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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Identify WebP processing componentsSearch the system for WebP-related libraries and applications: check for libwebp, ImageMagick, browsers, or any software that handles WebP images. On Linux: 'dpkg -l | grep -i webp' or 'find /usr -name "*webp*" 2>/dev/null'. On Windows: check installed programs for image editors or viewers.Affected if Any WebP processing software is installed on the system
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Check WebP library versionIf libwebp is found, query its version. On Linux: 'pkg-config --modversion libwebp' or check the shared library file version with 'ls -l /usr/lib/*/libwebp*'. Compare against any version that includes dimension validation fixes.Affected if The installed WebP library version predates the fix for dimension validation
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Verify WebP processing is active or accessibleDetermine if the system processes or can process untrusted WebP files. Check for services that accept image uploads, web servers serving user images, or applications that automatically process WebP files. Look for WebP support in image libraries (e.g., 'convert -list format' for ImageMagick).Affected if The system has components that process WebP files from untrusted sources
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Review crash logs for WebP-related panicsSearch system logs for WebP-related crashes or panics: 'journalctl -b | grep -i webp' on Linux, or check Windows Event Viewer under Application logs for crash events related to image decoding. Look for terms like 'VP8', 'canvas', 'dimension', or 'panic'.Affected if Logs show crashes or panics when processing WebP files with mismatched dimensions
The environment is affected if it runs any WebP decoder that processes untrusted WebP files and lacks validation that VP8 chunk dimensions match the declared canvas size, as this will cause a panic on malformed images.
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 the WebP decoder to validate that VP8 chunk dimensions match the declared canvas size before processing, returning a proper error instead of panicking on dimension mismatch.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-46601 — 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-2026-46601 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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