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CVE-2019-3902
A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic…
- 5.1MediumCVSS base score
- 1.4%Exploitation in 30 daysEPSS · top 28% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By redhat
- 4 months later
· 4 months later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.0 | Medium5.1 | CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Modified | 3.0 | Medium5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 1.4% · top 28% of all CVEs (11 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.1.
Affected products
The Mercurial Project · mercurial
- affected before 4.9
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPImercurialGHSA-mq66-vcfc-8246 (opens in a new tab)
References
References5
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [debian-lts-announce] 20190425 [SECURITY] [DLA 1764-1] mercurial security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29 (opens in a new tab)x_refsource_MISCx_transferred
- USN-4086-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- [debian-lts-announce] 20200731 [SECURITY] [DLA 2293-1] mercurial security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-0085 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-mq66-vcfc-8246 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2019-3902)Record last updated .