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Dear Maintainer,
A remote execution vulnerability has been reported in zeromq. Full details can be found on the upstream issue tracker [1].
The issue is fixed in upstream version v4.3.1, just released, or with the attached patch which is targeted for v4.2.5 (bionic and cosmic).
The latest version will hopefully arrive in disco via debian unstable soon, but I would recommend patching older releases.
As mentioned in the upstream tracker and the changelog, the issue can be mitigated by ASLR and by authentication via CURVE/GSSAPI. As far as I am aware no CVEs have been assigned nor have been requested as of now.