Updated Mercurial packages has been released for both Debian GNU/Linux 8 and 9

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Debian Security Advisory DSA-3963-1 security@debian.org
https://www.debian.org/security/ Sebastien Delafond
September 04, 2017 https://www.debian.org/security/faq
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Package : mercurial
CVE ID : CVE-2017-9462 CVE-2017-1000115 CVE-2017-1000116
Debian Bug : 861243 871709 871710

Several issues were discovered in Mercurial, a distributed revision
control system.

CVE-2017-9462 (fixed in stretch only)

Jonathan Claudius of Mozilla discovered that repositories served
over stdio could be tricked into granting authorized users access to
the Python debugger.

CVE-2017-1000115

Mercurial's symlink auditing was incomplete, and could be abused to
write files outside the repository.

CVE-2017-1000116

Joern Schneeweisz discovered that Mercurial did not correctly handle
maliciously constructed ssh:// URLs. This allowed an attacker to run
an arbitrary shell command.

For the oldstable distribution (jessie), these problems have been fixed
in version 3.1.2-2+deb8u4.

For the stable distribution (stretch), these problems have been fixed in
version 4.0-1+deb9u1.

We recommend that you upgrade your mercurial packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

  Mercurial Security Update for Debian 8 and 9