CVE-2019-13655
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 · uneditedImgix through 2019-06-19 allows remote attackers to cause a denial of service (resource consumption) by manipulating a small JPEG file to specify dimensions of 64250x64250 pixels, which is mishandled during an attempt to load the 'whole image' into memory.
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 confidenceImgix image processing library fails to properly validate image dimensions declared in JPEG headers. An attacker can craft a small JPEG file that claims massive dimensions (64250x64250 pixels), causing the system to attempt allocating enormous amounts of memory when loading the 'whole image,' leading to resource exhaustion and denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 2019-06-19CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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 Imgix library installationSearch for the imgix library in your project dependencies (e.g., check package.json, Gemfile, requirements.txt, composer.json, or node_modules/vendor directories)Affected if Imgix library is present in the environment
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Determine Imgix library versionRun the package manager command to display the installed version (e.g., npm list imgix, pip show imgix, gem list imgix) and compare to the release date of 2019-06-19Affected if Version or release date is on or before June 19, 2019
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Verify JPEG processing is enabledInspect the Imgix configuration files and source code for JPEG image processing routes and handlers that load the full image into memoryAffected if The application processes JPEG images using Imgix without additional dimension validation
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Check for recent memory exhaustion eventsReview application logs and system memory usage metrics around times when JPEG files were processed; look for out-of-memory errors or abnormal memory spikesAffected if Memory exhaustion or denial-of-service events occur after processing small JPEG files that claim unusually large dimensions
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Inspect loaded JPEG headersUse a hex editor or image analysis tool (e.g., exiftool, identify from ImageMagick) to examine the SOF0 marker section of processed JPEG files for dimension declarationsAffected if JPEG files being processed declare dimensions significantly larger than their actual file size (e.g., 64250x64250)
A user is affected if the Imgix library version is on or before June 19, 2019 AND the system processes JPEG images without validating declared dimensions against actual file size, leading to excessive memory allocation attempts.
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 dataImplement strict validation of declared image dimensions against actual file size and enforce memory allocation limits during image processing to prevent resource exhaustion from oversized dimension declarations.
- 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-2019-13655 — 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-2019-13655 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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