CVE-2026-13593
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 · uneditedCSS::Minifier::XS versions before 0.14 for Perl have a memory leak when the entire document is minified away. The minify function has a memory leak when processing a document containing only characters to be removed, such as comments and whitespace.
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 confidenceCSS::Minifier::XS versions before 0.14 contain a memory leak in the minify function that triggers when processing CSS documents consisting entirely of characters that get removed during minification (whitespace and comments). When the input document minifies to an empty string, memory is not properly freed, causing a leak.
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
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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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Check installed version of CSS::Minifier::XSRun: perl -M CSS::Minifier::XS -e 'print $CSS::Minifier::XS::VERSION' or check the version field in the installed module fileAffected if Version is less than 0.14 (e.g., 0.13, 0.12, etc.)
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Identify all Perl scripts or applications using CSS::Minifier::XSSearch codebase for 'use CSS::Minifier::XS' or 'require CSS::Minifier::XS' statementsAffected if The module is imported in any Perl application in your environment
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Examine input CSS sources processed by minify functionReview the CSS files or data streams passed to the minify() function in your codeAffected if Any processed CSS contains only whitespace characters (spaces, newlines, tabs) and CSS comments (/* ... */) without any actual CSS rules
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Test if CSS input minifies to empty stringRun the minify function on sample CSS input and verify if output length is 0Affected if The minify() function returns an empty string for any CSS input you process
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Monitor memory usage during minification operationsObserve process memory before and after calling minify() with CSS that contains only whitespace/commentsAffected if Memory grows significantly after processing such CSS without being released
You are affected if CSS::Minifier::XS version is below 0.14 AND your code processes CSS documents consisting entirely of whitespace and comments that would minify to an empty string.
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.
dbcve · scopedUpgrade CSS::Minifier::XS to version 0.14 or later. If upgrade is not immediately possible, avoid passing documents that contain only removable characters to the minify function as a temporary workaround.
Version 0.14
- Ensure you have Perl installed with access to CPAN or cpanm
- Backup your codebase before upgrading
- Run 'cpanm CSS::Minifier::XS' to install the latest version, or 'cpanm CSS::Minifier::[email protected]' to install version 0.14 specifically
- Alternatively, using cpan: run 'cpan CSS::Minifier::XS' to upgrade to the latest version
- Verify the installed version by running 'perl -M CSS::Minifier::XS -e 'print $CSS::Minifier::XS::VERSION'
- Test your application to confirm the memory leak is resolved and no functionality is broken
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 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 $1,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-13593 — 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-2026-13593 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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