Dear Users, I have updated the OpenSSL library bundled with the Windows installer to include zlib compression support and fixed a web server caching issue that resulted in invalid GPG signatures. Thank you very much for reporting these issues. The SHA-256 value of the updated file is: 32a88dcc5654f955266109be8bf10fd7d56fa4e125cab821ee508230570e46c5 stunnel-5.78-win64-installer.exe Best regards, Mike On 4/9/26 7:10 PM, Michał Trojnara 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