MEDIUM
CVE-2019-3902
CWE-22Published: April 22, 2019· Updated: Jun 17, 2026
5.1
CVSS v3.1
Official Description
A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic and write files outside a repository.
Technical Analysis
CVE-2019-3902 requires local access, meaning attackers must already have a foothold on the target system.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.1.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories
All References (10)
→
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902Issue Tracking · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2019/04/msg00024.htmlThird Party Advisory
→
https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902Issue Tracking · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2019/04/msg00024.htmlThird Party Advisory
→
https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29Third Party Advisory
Quick Facts
CVE IDCVE-2019-3902
CVSS Score5.1 / 10
SeverityMEDIUM
WeaknessCWE-22
CISA KEVNo
Affected3 vendor(s)
PublishedApr 22, 2019
Related CVEs (CWE-22)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-3902 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.