CVE-2018-19827
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 · uneditedIn LibSass 3.5.5, a use-after-free vulnerability exists in the SharedPtr class in SharedPtr.cpp (or SharedPtr.hpp) that may cause a denial of service (application crash) or possibly have unspecified other impact.
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 confidenceLibSass 3.5.5 contains a use-after-free vulnerability in the SharedPtr class (SharedPtr.cpp or SharedPtr.hpp). The issue allows an attacker to potentially trigger memory corruption by accessing memory after it has been freed, leading to denial of service through application crashes or possibly other unspecified impact.
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= 3.5.5CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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 installed LibSass versionRun 'libsass --version' or check the library binary metadata. If using a package manager (npm, gem, etc.), run 'npm list libsass' or equivalent to query the installed version.Affected if The installed version is exactly 3.5.5 (note: other versions may also be vulnerable but only 3.5.5 is confirmed affected in this CVE)
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Locate SharedPtr source filesSearch for SharedPtr.cpp or SharedPtr.hpp in the LibSass installation directory or source tree: 'find /path/to/libsass -name "SharedPtr.cpp" -o -name "SharedPtr.hpp"'Affected if These files exist in the LibSass version being used, indicating the vulnerable code is present
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Inspect SharedPtr.cpp or SharedPtr.hpp for use-after-free patternsExamine the SharedPtr.cpp or SharedPtr.hpp source file for the vulnerable code path that allows accessing freed memory. Look for any code that dereferences a shared pointer after it has been released or reset.Affected if The vulnerable code pattern exists in the SharedPtr implementation and the application exercises that code path
A user is affected if LibSass version 3.5.5 is installed and any application or process actively uses LibSass to compile Sass stylesheets, as this triggers the vulnerable SharedPtr code path.
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 dataUpgrade LibSass to a patched version that addresses the use-after-free in SharedPtr. If immediate upgrade is not feasible, audit any applications or systems using LibSass 3.5.5 for potential exploitation vectors.
- Consultation3.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-19827 — 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-2018-19827 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
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