CVE-2026-55035
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 · uneditedOut-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
In the news
Third-party coverage- Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days
- Microsoft CVE Summary - Bleeping Computer
Surfaced from public web coverage — external links open in a new tab.
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 confidenceAn out-of-bounds read vulnerability exists in Microsoft Office that allows a local unauthorized attacker to read sensitive information from memory beyond intended boundaries. This type of vulnerability accesses memory outside the allocated buffer, potentially exposing data in the application's memory space.
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
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/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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Verify Microsoft Office installationOpen Programs and Features (appwiz.cpl) or check for Office applications such as Word, Excel, PowerPoint, or OutlookAffected if Microsoft Office is not installed - not affected by this Office vulnerability
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Determine installed Office versionOpen any Office application, go to File > Account > About [Application], or run 'winver' to check Windows and Office activation statusAffected if Unable to determine the installed Office version - further investigation required
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Compare version against CVE-affected rangeSince no specific version range is provided in this CVE, check the installed version against your organization's patch inventory or compare to the current publicly available Microsoft Office version on the Microsoft Update CatalogAffected if Running an Office version that is older than the version containing the CVE-2026-55035 fix
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Confirm security update statusIn any Office app, go to File > Account > Update Options > View Update History, or check Windows Update > View update history for recent Office security updatesAffected if Security updates for Office are not installed or the specific CVE update is missing
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Review Office file handling exposureOut-of-bounds read vulnerabilities in Office are typically triggered by specially crafted document files. Audit whether users regularly open Office documents from untrusted or external sourcesAffected if Users frequently open Office files from untrusted sources without prior validation
A user is affected if Microsoft Office is installed and the environment is running a version prior to the security update that addresses CVE-2026-55035.
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 dataApply the latest Microsoft Office security updates via Windows Update or manual patch deployment to address this vulnerability.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 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 $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-55035 — 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-2026-55035 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data