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CVE-2017-17458

33
FAUCET Score

CVE-2017-17458 is a critical vulnerability in Mercurial versions prior to 4.4.1, affecting Debian Linux and Mercurial itself. It allows for arbitrary code execution via specially crafted Git subrepositories that can trigger a .git/hooks/post-update script. With a CVSS score of 9.8, this vulnerability presents a critical risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.4.1CPE matchmatch criteria
cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.33%
Probability of exploitation in next 30 days
EPSS Percentile
92.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0633 is in the 88th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

pippatch availablevia ghsa
Product: mercurialFixed in: 4.4.1
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: mercurial
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: mercurial

Vendor Advisories (2)

pipGHSA-6v56-cpg6-3rpxcritical

Mercurial vulnerable to arbitrary code injection

May 13, 2022
redhatCVE-2017-17458Moderate

mercurial: arbitrary command execution in mercurial repo with a git submodule

Nov 3, 2017

References

bz.mercurial-scm.org / show_bug.cgi
Issue TrackingThird Party Advisory
confluence.atlassian.com / sourcetreekb/sourcetree-security-advisory-2018-01-24-942834324.html
Third Party Advisory
lists.debian.org / debian-lts-announce/2017/12/msg00027.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2018/07/msg00005.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2018/07/msg00041.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2020/07/msg00032.html
mercurial-scm.org / pipermail/mercurial-devel/2017-November/107333.html
Vendor Advisory
mercurial-scm.org / wiki/WhatsNew
Vendor Advisory
securityfocus.com / bid/102926
Third Party AdvisoryVDB Entry