Dear Users,
I have released version 5.81 of stunnel.
### Version 5.81, 2026.09.16, urgency: HIGH
* Security bugfixes
- OpenSSL DLLs updated to version 3.5.8.
- Fixed truncation and out-of-bounds reads when inheriting binary
session ticket keys containing null bytes (thanks to Jose A.
Diaz).
- Prevented OCSP stapling response failures from terminating the
daemon (thanks to Jose A. Diaz).
* Bugfixes
- Avoided spurious sysconf error messages after successful
descriptor-limit
queries on platforms where a successful call may change errno.
- Fixed a potential crash when parsing empty ASCII PSK secrets
(thanks to Jose A. Diaz).
- Fixed a memory leak after DTLS listener poll errors and timeouts
(thanks to Jose A. Diaz).
- Fixed memory leaks during NTLM HTTP proxy negotiation
(thanks to Jose A. Diaz).
- Fixed early startup logging before thread lock initialization
(thanks to Jose A. Diaz).
- Rejected excessively nested configuration includes instead of
consuming the process stack recursively.
* Features
- Improved TLS and DTLS shutdown diagnostics.
Home page: https://www.stunnel.org/
Download: https://www.stunnel.org/downloads.html
SHA-256 hashes:
1d1b48fa26a06a5a035ca5ddc7377c75d5d78ad6f3b4886352a84818c854f932
stunnel-5.81.tar.gz
ec16df6313dced7c84f20dbb9c677847d0a5219bdd35ab40cde18c135abd0411
stunnel-5.81-win64-installer.exe
5eec038e3a9c44d135942c2486ffa5156c02cfcf31bb5b7a65c6134c459a49f9
stunnel-5.81-android.zip
Best regards,
Mike