Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2019-3902

21
FAUCET Score

CVE-2019-3902 is a path traversal vulnerability in Mercurial versions prior to 4.9, affecting various Debian and Red Hat distributions. This flaw allows an attacker to write files outside of a repository by manipulating symlinks and subrepositories. With a CVSS score of 5.9 (Medium), it has a network attack vector and high integrity impact, but requires high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.9CPE matchmatch criteria
cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.1MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.4
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.41%
Probability of exploitation in next 30 days
EPSS Percentile
70.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0141 is in the 41st percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (4)

pippatch availablevia ghsa
Product: mercurialFixed in: 4.9
redhatvendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: mercurial
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mercurial

Vendor Advisories (2)

pipGHSA-mq66-vcfc-8246medium

Mercurial Path Traversal/Link Following vulnerability

Feb 15, 2022
redhatCVE-2019-3902Moderate

mercurial: Path-checking logic bypass via symlinks and subrepositories

Mar 13, 2019

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory
lists.debian.org / debian-lts-announce/2019/04/msg00024.html
Third Party Advisory
lists.debian.org / debian-lts-announce/2020/07/msg00032.html
usn.ubuntu.com / 4086-1
mercurial-scm.org / wiki/WhatsNew
Third Party Advisory