CVE-2018-11575
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 · uneditedngiflib.c in MiniUPnP ngiflib 0.4 has a stack-based buffer overflow in DecodeGifImg.
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 confidenceA stack-based buffer overflow vulnerability exists in the DecodeGifImg function of ngiflib.c in MiniUPnP ngiflib 0.4. The vulnerability allows overflow of a stack-allocated buffer during GIF image decoding, likely due to insufficient bounds checking when processing GIF image data.
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= 0.4CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 ngiflib presenceSearch for the ngiflib library or its source files (ngiflib.c) in your environment. Check build artifacts, dependencies, or imported libraries that may include this component.Affected if ngiflib version 0.4 is found in your environment
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Verify the installed versionCheck the version declaration in ngiflib source files, headers, or library metadata. Look for version 0.4 specifically.Affected if The version is 0.4 exactly, or a version that includes the vulnerable code without patches
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Confirm GIF decoding is enabledInspect whether your application or service uses the DecodeGifImg function for processing GIF images. Check code that calls this function or links against ngiflib for GIF decoding capabilities.Affected if GIF image decoding using DecodeGifImg is actively used or linked into your application
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Check for vulnerable code patternReview the DecodeGifImg function in your copy of ngiflib.c for insufficient bounds checking on image dimensions or data during GIF decoding.Affected if The source code shows the vulnerable version without bounds validation patches applied
You are affected if ngiflib version 0.4 is present in your environment and GIF image decoding via the DecodeGifImg function is utilized.
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 to a patched version of ngiflib if available; otherwise, implement proper bounds validation on GIF image dimensions and data before processing in DecodeGifImg.
- Consultation3.0 h
- Implementation6.0 h
- Testing5.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,752.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-11575 — 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-2018-11575 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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