Gentoo Linux Security Advisory 201612-19 - Multiple vulnerabilities have been found in Mercurial, the worst of which could lead to the remote execution of arbitrary code. Versions less than 3.8.4 are affected.
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Debian Linux Security Advisory 3570-1 - Blake Burkhart discovered an arbitrary code execution flaw in Mercurial, a distributed version control system, when using the convert extension on Git repositories with specially crafted names. This flaw in particular affects automated code conversion services that allow arbitrary repository names.
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Slackware Security Advisory - New mercurial packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix a security issue.
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