CVE-2026-20889
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 · uneditedA heap-based buffer overflow vulnerability exists in the x3f_thumb_loader functionality of LibRaw Commit d20315b. A specially crafted malicious file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.
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 confidenceA heap-based buffer overflow vulnerability exists in the x3f_thumb_loader functionality of LibRaw. The vulnerability is triggered when processing a specially crafted malicious X3F file, allowing an attacker to overflow heap-allocated memory buffers.
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= 0.22.0CVSS 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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Check installed LibRaw versionUse 'pkg-config --modversion libraw' or query your package manager for the libraw package version. Alternatively, use 'strings' on the installed library file to find version strings.Affected if The installed version is exactly 0.22.0
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Verify x3f_thumb_loader component is presentSearch for the x3f_thumb_loader function in the LibRaw source code or binary using 'grep -r x3f_thumb_loader' on the library files or headers installed on the system.Affected if The x3f_thumb_loader component exists in the installed LibRaw version
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Identify X3F file processing in your environmentSearch application logs, file processing records, or audit logs for .x3f file processing activity. Check if any applications using LibRaw handle X3F image files.Affected if X3F files are processed by applications using the affected LibRaw version
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Check for vendor or security patches applied to LibRawReview the installed package changelog or security advisory logs to see if a patch for CVE-2026-20889 has been applied to the libraw installation.Affected if No security patch for this CVE has been applied to version 0.22.0
Environment is affected if LibRaw version 0.22.0 is installed, the x3f_thumb_loader component is present, and X3F files are processed without a security patch applied.
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 dataUntil an official patch is available, avoid processing untrusted X3F files with LibRaw and implement input validation/size limits on thumbnail data. Monitor LibRaw security advisories for updates.
- Consultation4.0 h
- Implementation12.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,808.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-20889 — 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-2026-20889 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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