CVE-2026-58056
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 · uneditedRustDesk gates incoming control messages on per-capability flags rather than on the session's authorized connection type, and a file-transfer session does not clear those flags. A peer holding only a valid FileTransfer authorization can inject keyboard and mouse input and reach the unguarded screenshot and display-capture handlers, acting outside its granted scope.
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 confidenceRustDesk improperly scopes per-capability flags to connection sessions—a peer authorized only for file transfer retains flags enabling keyboard/mouse input injection and access to screenshot/display-capture handlers, allowing actions outside the granted file-transfer scope.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
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 RustDesk installation and versionRun `rustdesk --version` or check package manager for rustdesk package versionAffected if RustDesk version exists and matches potentially vulnerable versions (check vendor advisory for specific range)
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Verify file-transfer capability configurationInspect RustDesk configuration files (typically in ~/.rustdesk or /etc/rustdesk) for session capability settings related to file transferAffected if Configuration shows file-transfer sessions retain input/screenshot/display-capture capability flags from session initialization
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Review session capability handling logsEnable debug logging in RustDesk and observe session establishment logs for file-transfer connections - check if input/screenshot permissions are shown as activeAffected if Logs indicate that a file-transfer only connection has input-injection or screenshot capabilities available
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Test file-transfer session scopeEstablish a file-transfer-only connection to the RustDesk server and attempt to access input-injection or screenshot/display-capture featuresAffected if File-transfer session successfully accesses input handlers or captures screenshots/display when it should not have those permissions
User is affected if file-transfer only connections can inject input or capture screens, indicating capability flags were not cleared at session establishment.
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 dataImplement session-type-aware capability gating: ensure file-transfer authorization clears input and capture capability flags, and enforce authorization checks on all handlers regardless of prior capability state.
- Consultation3.0 h
- Implementation8.0 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 $4,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-58056 — 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-2026-58056 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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