CVE-2026-26833
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 · uneditedthumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.
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 confidenceThe thumbler library versions 1.1.2 and below contain an OS command injection vulnerability in the thumbnail() function. User-supplied input from the input, output, time, and size parameters is directly concatenated into a shell command string and passed to Node.js child_process.exec() without any sanitization or escaping, allowing attackers to execute arbitrary OS commands.
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<= 1.1.2CVSS 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:3.1/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 thumbler library installation and versionCheck your project dependencies (package.json or node_modules/thumbler/package.json) to see if thumbler is listed and note its version numberAffected if thumbler version is 1.1.2 or lower, or any version if not specified (library was never patched)
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Locate thumbnail() function usage in codeSearch your codebase for imports of thumbler and calls to the thumbnail() function, typically found in route handlers or image processing logicAffected if thumbnail() function from thumbler is imported and invoked in your code
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Verify child_process.exec() is used in thumbnail callExamine the thumbler library source code (node_modules/thumbler/thumbler.js or similar) and look for child_process.exec() being used to execute the thumbnail commandAffected if child_process.exec() is present in the thumbnail implementation (vulnerable pattern)
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Trace user input to vulnerable parametersAudit code paths where thumbnail() is called and identify if request parameters (query strings, form data, JSON body) flow into the input, output, time, or size arguments without validationAffected if unsanitized user-controllable data reaches any of the four vulnerable parameters (input, output, time, size)
You are affected if thumbler library is installed and your code passes user-supplied input to the thumbnail() function's input, output, time, or size parameters while the library uses child_process.exec().
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 to thumbler version 1.1.3 or later, which should address the command injection by implementing proper input validation or using safer alternatives to child_process.exec() such as child_process.execFile() with argument arrays.
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-26833 — 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-2026-26833 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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