SHA256 hash of UltraVNC_1830_X86_Setup.exe:
3a6d1e3e63b353c3392d0193e67e349440268fe2d7d6769ec184d3d9eb15aa13

SHA256 hash of UltraVNC_1830_X64_Setup.exe:
e9c22419ef3128a707b0d004a2c58e25459528c5c12d104dea56e5e662bd131e

SHA256 hash of UltraVNC_1830.zip:
11163a0b9b86321bf6403eb0cf84b81f7230ce32e6291377e1fe5beb987f7e4f

SHA256 hash of UltraVNC_1830_x86_Setup.msi:
22eecb787544676c562ebcfa4fb1f25d227a5de6963a0bc08559a3295351e0f3

SHA256 hash of UltraVNC_1830_x64_Setup.msi:
fe689bd018b9faf9a9e7fe8640f9184d57e072e01b97afcd61ffc0c3eb2067e3

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UltraVNC – Changelog

1.8.2.4 – June 2026

• Filetransfer using commandline
  
  

1.8.2.3 – June 2026

• Fixed
  CVE-2026-7840 | CVE-2026-7839 | CVE-2026-7838 | CVE-2026-7831 | CVE-2026-7830
  CVE-2026-7829 | CVE-2026-7828 | CVE-2026-44040 | CVE-2026-44041 | CVE-2026-44042
• stronger encryption for mslogon user/passwd // MS-Logon III: X25519 + AES-256-GCM, replaces weak 31-bit DH (FINDING-002)
• layout fix to make translations fit
• update translations ( ru added)
• skip close request when sc_exit is used
• REGRESSION: Repeater:proxy setting not loading correctly on VNC Viewer in 1.8.2.2 #359
• #360 #361 timeouts and blacklist
  

  ---CVE INFO----
  CVE-2026-7840 Pre-auth repeater hdrbuf overflow (F-005) 9.8 ✔ FIXED
  CVE-2026-7839 Hardcoded repeater admin password (F-006) 9.1 ✔ FIXED
  CVE-2026-7838 Viewer reasonLen heap overflow (F-010) 8.8 ✔ FIXED
  CVE-2026-7831 Viewer nameLength off-by-one (F-011) 7.5 ✔ FIXED
  CVE-2026-7830 MS-Logon II weak DH / broken RNG (F-002) 7.4 ✔ FIXED
  CVE-2026-7829 Repeater rule-parser OOB write (F-007) 7.2 ✔ FIXED
  CVE-2026-7828 win_log allocation integer overflow (F-009) 5.3 ✔ FIXED
  CVE-2026-44040 Weak RNG in vncauth.c (F-001) 4.8 ✔ FIXED
  CVE-2026-44041 vncWc2Mb OOB wcslen read (F-004) 4.3 ✔ FIXED
  CVE-2026-44042 wi_uudecode boundary off-by-one (F-008) 3.7 ✔ FIXED

  Note on CVE-2026-7830 — MS-Logon II / Broken DH

  During fix validation we observed that the 31-bit DH implementation in MS-Logon II was documented by the original author in 2006 as a deliberate workaround ("I know that this is no breakthrough in modern cryptography. It's just a patch/kludge/workaround.") rather than an inadvertent weakness. We are updating the CVE-2026-7830 NVD description accordingly:

  The weakness is scoped to the legacy MS-Logon II authentication path (rfbUltraVNC_MsLogonIIAuth), retained solely for backward compatibility with unupgraded servers.
  The preferred path in the fix build is MS-Logon III (rfbUltraVNC_MsLogonIIIAuth) — X25519 ECDH + AES-256-GCM via libsodium — providing 128-bit equivalent security.
  When both client and server support MS-Logon III, MS-Logon II is never negotiated.
  A passive downgrade risk remains for connections to unupgraded servers or under active MITM.
  We recommend users upgrade server components to enable MS-Logon III and disable MS-Logon II in server configuration where possible.

  CVSS 7.4 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N) is unchanged — AC:H reflects the legacy-server or MITM precondition.
  ----------------

  
  
  

1.8.2.2 – May 2026

• Translation
• UI layout fixes

1.8.2.1 – May 2026

• CVE-2026-3787 CWE-428
• remove creation empty folder for snapshots on init FT history change font setting

1.8.2.0 – May 2026

• Bridge removed (not functional, moved to 1.9.x branch)

1.8.1.1 – May 2026

• FileTransfer fixes
• Use Windows 7 compatible zip/unzip option
• Security fix

1.8.1.0 –May 2026

• FileTransfer fixes

1.8.0.9 – April 2026

• FileTransfer fixes

1.8.0.8 – April 2026

• Fix logging: correct initialization order — log file now properly opened on startup (service + app mode)
• Fix #340: logging not active on server startup
• Fix #259: Desktop/Downloads show 'media not present' when running as service
• Fix #189: file transfer fails after window close in kiosk/no-shell mode
• Fix: prevent International keys and Alternate keyboard from being enabled simultaneously
• Fix new zip/unzip bug
• Fix FT: Refresh button misaligned on resize; stale !UVNCDIR- entry after folder receive
• Fix virtual key (virtKey!=69)
• File Transfer: update zip/unzip with Unicode + long filename support
• File Transfer: add progress indication while folder is being zipped
• File Transfer: add Refresh button
• File Transfer: show file extension and date columns
• Update CMake and Qt project files
• Installer and minor changes

1.8.0.6 – April 2026

• FileTransfer fix folder transfer
• OpenSSL 3.6.2
• libsodium 1.0.22
• setpasswd/createpasswd write to %ProgramData% instead of current folder
• Fix path mslogon

1.8.0.5 – April 2026

• FileTransfer: bigger buffers needed for UTF-8/UTF-16
• UI Unicode fixes
• Unicode logging
• Baseline library updates:
  • libjpeg-turbo 3.1.4.1
  • liblzma 5.8.3
  • libsodium 1.0.21#1
  • zlib 1.3.1
  • zstd 1.5.7
  • OpenSSL 3.6.1#3

1.8.0.4 – April 2026

• Unicode and encryption plugin
• Unicode UI

1.8.0.3 – March 2026

• Sync server and viewer keyboard handling — fixes:
  • Incorrect handling of Cyrillic (0x06a1-0x06ff) — treated as Unicode instead of X11 keysym
  • Incorrect handling of Greek (0x07a1-0x07f9)
  • Incorrect handling of Hebrew (0x0cdf-0x0cfa)
  • Incorrect handling of Arabic (0x05ac-0x05fe)
  • Incorrect handling of Thai (0x0da1-0x0df9)
  • Incorrect handling of Korean (0x0ea1-0x0eff)
  • Unicode keysyms (0x01000000+) not handled

1.8.0.2 – March 2026

• Unicode viewer fixes

1.8.0.0 – March 2026

• FileTransfer, Chat, keyboard Unicode support
• Minor optimizations
• VNCViewer Unicode build

1.7.1.10 – February 2026

• FileTransfer Unicode
• Fix FileTransfer failure on RDP sessions
• Use system fonts for chat

1.7.1.9 – February 2026

• FileTransfer Unicode
• Mark inaccessible folders red in FileTransfer
• Use secure copy_s functions
• LoadLibrary: limit path search

1.7.1.7 – February 2026

• Copy/paste removed
• Extended FileTransfer dialog

1.7.1.6 – February 2026

• Longer host field
• Two-way copy/paste
• Mark inaccessible folders red in FileTransfer
• Fix save/load config file
• Accept/Refuse: default changed to query

1.7.1.5 – February 2026

• Speed up FileTransfer
• Fix color cursors
• Fix FileTransfer and unreadable folders
• Fix viewer load/save settings, encryption saving, buffer overrun
• Viewer: larger host field

1.7.1.1 – January 2026

• UniChat (Unicode chat)
• Copy/paste files
• Listen mode fix

1.7.1.0 – December 2025

• FileTransfer optimized (minimum 2x faster)
• Bridge mode
• Translations (French, German, Spanish, Chinese)
• Use proper INI path (ultravnc.ini) + portable mode
• Fix: Accessibility enlarged cursor showed a black rectangle
• Fix IPv6
• Fix 'Use Only Default ConfigFile' option
• Fix quick options
• Update libraries:
  • libjpeg-turbo: 3.1.2
  • liblzma: 5.8.1
  • OpenSSL: 3.6.0#3
  • zlib: 1.3.1
  • zstd: 1.5.7

1.6.4.0 – June 2025

• Update viewer layout
• Viewer, SessionDialog wrong size after dpi change #278
• Fix to small msg buffer size
• Fix big border (ThomasLevering)
• Update GNOME /QEMU display settings text + zlibbuffer was unneeded recrated
• Fix vncviewer crash #58
• FIX empty password detection, also for SC
• Fix bug in undefer_input() that misplaced the input state. (#272)
• Do not accept Anonymous TLS sub-types during VeNCrypt authentication (#274)
  But allow fallback to standard RFB types (e.g. rfbVncAuth)

1.6.1.0 – May 2025

• Fixed Chat Japanese chars
• Fixed saving listenport
• Fixed saving custom messages accept/reject
• Fixed save settings should not reload defaults

1.6.0.0 – April 2025

• Updated dev version to release.

1.5.0.18-dev – April 2025

• Use single DLL instead of V2 version.

1.5.0.17-dev – April 2025

• International keyboard fix.

1.5.0.16-dev – April 2025

• Viewer defaults were not loading.

• Possible keyboard fix (to verify) — supports characters like +ěščřžýáíé=´.

• Renamed authSSPV2 loggingV2.dll to fix Event Viewer messages on x64.

• Echoserver fix.

• Fix for broken sc_20 build.

Keyboard Notes:

• The "international keyboard" option must be enabled on the server.

• Only tested using a virtual Czech keyboard.

Bug Detail:

• Viewer defaults missing caused issues like incorrect INI viewonly mode and wrong encoding settings.

1.5.0.15-dev – March 2025

• File Transfer: Fixed buffer overflow and memory leak (#254).

• Added service to settings.

• Log file movement fix.

1.5.0.14-dev – March 2025

• Slider fix.

• Fixed DSMPlugin and MS-Logon settings when running as standalone.

• Resolved bug where own messages weren’t logged due to logfile move.

1.5.0.13-dev – March 2025

• Moved log file to the ultravnc.ini folder.

1.5.0.12-dev – March 2025

• File Transfer window size fix.

• Fix for crash on Microsoft Windows 7.

• Installer: Added "Run as admin" to settings shortcut.

• Installer: .ini file now copied to ProgramData before service starts.

1.5.0.10-dev – March 2025

• DSMPlugin configuration fix.

• Fixed "Apply Save Settings" functionality.

• Clearing admin password also clears VNC password.

• ISOtime added in About window + smaller max size.

1.5.0.9-dev – March 2025

• Removed installer popups.

• Fixed issue where some settings weren’t saved correctly.

1.5.0.8-dev – March 2025

• Save settings fix.

• Typo correction.

• Added Bluesky integration.

1.5.0.7-dev – March 2025

• Command line can now overwrite default values.

• Settings dialog can run standalone.

• Viewer: Focus set to host input field.

• General bug fixes.

1.5.0.5-dev – February 2025

• Fallback to old folder if ultravnc.ini is missing.

• Command line options take priority in Viewer.

• Encryption fix for viewonly (VNC password).

• UI/UX: Settings dialog enable/disable cosmetic fix.

• Plugin architecture check (32/64-bit) before use.

• Chunked messages and default client certs allowed in TLS (#250).

• Rules fix.

1.5.0.4-dev – February 2024

• UI update.

• Moved ini file to ProgramData.

• Bug fixes (see Git).

• Added admin password functionality.

1.5.0.3-dev

• UI corrections.

1.5.0.2-dev

• Merged IPv4 & IPv6 into a single EXE with switchable property.

• Fixed RealVNC UDP port usage.

• UI improvements: layout and icons.

1.5.0.1-dev

• Reverted fonts in File Transfer.

• Fullscreen: Added Chat and File Transfer to topbar.

1.5.0.0-dev

• DirectX reconnect fix.

• Added extra links.

• Text/version info fixes.

• Switched to vcpkg for easier library maintenance.

• Fixed stack corruption (#185).

1.4.4.0-dev

• Code cleanup.

• UI spellcheck and standardization.

• TLS: Added CertVerifyCertificateChainPolicy API (#144).

• Switched to Arial font.

• TLS-encrypted transport via VeNCrypt authentication (#142).

• WIP: RSA-AES auth & encryption (#139).

• Fixed typo: "Repetear" → "Repeater" (#138).

• Windows Recovery Environment (WinRE 10) fix.

• Snapshot naming now sortable by date.

• Unified omnithread usage for Server and Viewer.

• Reinit D3D device on invalid pre-update (#130).

• SC: UAC restoration with try/catch.

• Scrollbar added to properties.

• Fixed group default settings load order.

• SC UAC reset fix.

• Able to connect to Debian v12 "bookworm" via WayVNC (#133).

License

GNU GENERAL PUBLIC LICENSE (GPL)

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

https://www.gnu.org/licenses