CVE-2026-6040
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 use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use.
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 heap use-after-free vulnerability exists in ODF number format parsing where blank-width characters are imported. The code reads a position value from the document without validating it against the format-code string length, allowing malformed number formats to access memory outside the allocated string boundary.
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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/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 ODF-processing softwareList all installed software that can open or process ODF documents (such as LibreOffice, Apache OpenOffice, or other office suites). Check installed packages or programs.Affected if Any version of software that parses ODF documents is present and the version is within affected ranges (if known) or unpatched.
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Check software versionRun the version command for the ODF-processing software (for example, 'libreoffice --version' or check application 'About' dialog). Compare against any published affected version ranges from the vendor.Affected if The installed version matches or falls within known affected version ranges.
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Verify ODF number format parsing is activeInspect whether the software has modules or extensions that handle ODF number format parsing. Look for configuration files or runtime settings related to ODF/ODT import or number formatting.Affected if ODF document parsing and number format processing features are enabled or loaded.
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Inspect recent ODF document activityReview recent file access logs, temporary files, or document history to identify ODF files (with .odt, .ods, .odp extensions) that have been opened or processed.Affected if ODF documents from untrusted sources have been opened recently.
A user is affected if they have installed ODF-processing software with an unpatched version where ODF number format parsing is enabled and untrusted ODF documents can be opened.
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 to fixed versions of the affected software. Until patches are available, exercise caution when opening ODF documents from untrusted sources.
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-6040 — 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-2026-6040 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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