Description
stream_engine.cpp in libzmq (aka ZeroMQ/C++)) 4.0.5 before 4.0.5 allows man-in-the-middle attackers to conduct downgrade attacks via a crafted connection request.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | zeromq3 | 4.0.5+dfsg-1 | — |
| Debian 13 | zeromq3 | 4.0.5+dfsg-1 | — |
| Debian 12 | zeromq3 | 4.0.5+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | zeromq3 | 4.0.4+dfsg-2ubuntu0.1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | zeromq | 4.2.0-1.1 | openSUSE-SU-2024:10038-1 |
Advisories 1
- openSUSE-SU-2024:10038-1 libzmq5-4.2.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- [oss-security] 20140927 Re: CVE request: zeromq mailing-list
- openSUSE-SU-2014:1381 vendor-advisory
- zeromq-handshake-sec-bypass(96241) vdb-entry
- https://github.com/zeromq/libzmq/pull/1188
- openSUSE-SU-2014:1493 vendor-advisory
- 70157 vdb-entry
- https://github.com/zeromq/libzmq/issues/1190
- [oss-security] 20140926 CVE request: zeromq mailing-list
- 62262 third-party-advisory