CVE-2018-11657
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 an infinite loop in DecodeGifImg and LoadGif.
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 denial-of-service vulnerability exists in ngiflib 0.4 where malformed GIF image data can trigger an infinite loop in the DecodeGifImg and LoadGif functions during GIF parsing, causing the application to hang or become unresponsive.
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
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/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 ngiflib installationSearch for ngiflib library files in your system or check your project's dependency manifest (package.json, requirements.txt, conanfile.txt, or similar). Look for 'ngiflib' and its version number.Affected if ngiflib version 0.4 is present in your environment or dependencies
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Locate the ngiflib source or binaryIf ngiflib is bundled with your application, locate the source file (usually named ngiflib.c, ngiflib.h, or similar) or the compiled library binary. Check the version comment or header in the source code.Affected if The source code or binary version is identified as 0.4
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Verify GIF processing capabilityDetermine if your application or any component links to and calls ngiflib functions. Search your codebase for calls to 'LoadGif' or 'DecodeGifImg' functions, or check if your application accepts or processes GIF image files as input.Affected if Your application processes GIF files using ngiflib functions such as LoadGif or DecodeGifImg
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Inspect function calls in binaryIf using a compiled binary, inspect exported symbols or dynamically linked libraries to confirm ngiflib is in use. Run 'nm' or 'objdump' on your binary and search for 'LoadGif' or 'DecodeGifImg' symbols.Affected if These vulnerable functions are present in your deployed binary
You are affected if ngiflib version 0.4 is deployed in your environment and your application uses it to process GIF files via the LoadGif or DecodeGifImg functions.
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 ngiflib to a patched version that properly bounds loop iterations, or implement input validation to reject malformed GIF files before passing them to the library.
- 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-2018-11657 — 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-2018-11657 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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- Version or environment caveats, and links to real fixes
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