CVE-2017-9462

Publication date 6 June 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In Mercurial before 4.1.3, "hg serve --stdio" allows remote authenticated users to launch the Python debugger, and consequently execute arbitrary code, by using --debugger as a repository name.

From the Ubuntu Security Team

It was discovered that Mercurial incorrectly handled repository names. An attacker could possibly use this issue to execute arbitrary code.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
mercurial	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	17.10 artful	Fixed 4.3.1-2
	17.04 zesty	Ignored end of life
	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Fixed 3.7.3-1ubuntu1.1
	14.04 LTS trusty	Fixed 2.8.2-1ubuntu1.4

Notes

sbeattie

backported patches in debian bug report

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
mercurial	Upstream: https://www.mercurial-scm.org/repo/hg/rev/77eaf9539499

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H