stunnel 5.78 released

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Michał Trojnara

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Apr 9, 2026, 1:03:45 PM (5 days ago) Apr 9

to stunne...@stunnel.org, stunnel-...@stunnel.org, openss...@openssl.org

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