Hi Thomas, Yes. It looks like this version 5.78 requieres the zlib1.dll to be present to run. The release notes document the fact that win32 openssl was built with zlib and zstd support. I just compiled zlib 1.3.2 with GCC x64 and dropped the generated zlib1.dll under "C:\program Files (x86)\stunnel\bin" and the binaries openssl.exe, stunnel and tstunnel.exe run fine. It looks like the new ZLIB1.DLL dpendency was missed from the installer package. Surely Michal will inmediatamente release a fixed installer. Regards, Jose A. Diaz On Thursday, April 9, 2026 at 02:34:22 PM GMT-5, Thomas Eifert via stunnel-users <stunnel-users@lists.stunnel.org> wrote: This is on Windows 10. Re-installed version 5.77 and all is okay again. On 4/9/2026 12:26 PM, Thomas Eifert via stunnel-users wrote:
I couldn't install or run the new version. Please see the attached screenshot with the error message.
On 4/9/2026 10:10 AM, Michał Trojnara via stunnel-users wrote:
Dear Users,
I have released version 5.78 of stunnel.
### Version 5.78, 2026.04.09, urgency: MEDIUM * Security bugfixes - OpenSSL DLLs updated to version 3.5.6. * Bugfixes - Fixed WIN32 transfer() loop errors with OOB TCP. - Fixed a memory leak introduced in version 5.73. - Build fix for systems without timegm() (thanks to Jose A. Diaz and Shubham Gupta). - Fixed a startup crash when both global (default) and service-level lists of values are configured for an option. * Features - Support for zstd and brotli compression with OpenSSL 3.2 and TLS 1.2 or older. - WIN32 OpenSSL build with zlib and zstd support. - Support for new "options" parameter values. - Less bloated errors on an invalid configuration file. - Documentation updated from Pod to Pandoc Markdown. - Removed support for OpenSSL versions older than 0.9.8. The final update for the OpenSSL 0.9.7 branch (0.9.7m) was issed on 23 Feb 2007.
Home page: https://www.stunnel.org/
Download: https://www.stunnel.org/downloads.html
SHA-256 hashes: 8727e53bb8b7528f850327a2a149158422c02183bc120d1d733cc65b1e2c349d stunnel-5.78.tar.gz 541700197ce2e03dd86b343d9cbf6434359cca9f44e6927fde1d2c76c355c3e6 stunnel-5.78-win64-installer.exe b585d0828165d2e317f3956f2657fa6fb265b34b3ff49181bf561acd8eea2500 stunnel-5.78-android.zip
Best regards, Mike
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