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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Mercurial Project | mercurial | before 4.9 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mercurial | 4.9-1 | — |
| Debian 13 | mercurial | 4.9-1 | — |
| Debian 12 | mercurial | 4.9-1 | — |
| Debian 9 | mercurial | 4.0-1+deb9u2 | DLA-2293-1 |
| Debian 8 | mercurial | 3.1.2-2+deb8u7 | DLA-1764-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | mercurial | 4.5.3-1ubuntu2.2 | USN-5102-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | mercurial | 3.7.3-1ubuntu1.2+esm2 | USN-5102-2 |
| Ubuntu Pro 14.04 LTS | mercurial | 2.8.2-1ubuntu1.4+esm1 | USN-5102-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | mercurial | 2.8.2-15.18.4 | SUSE-SU-2020:3003-1 |
| SLES 2 | mercurial | 4.5.2-3.9.44 | SUSE-SU-2020:1709-2, SUSE-SU-2020:1709-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mercurial | 5.9.1-2.1 | openSUSE-SU-2024:10586-1 |
| openSUSE Leap 15.2 | mercurial | 4.5.2-lp152.7.3.1 | openSUSE-SU-2020:0880-1 |
| openSUSE Leap 15.1 | mercurial | 4.5.2-lp151.6.3.1 | openSUSE-SU-2020:0869-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mercurial | 4.9-r0 | — |
| Alpine v3.23 | mercurial | 4.9-r0 | — |
| Alpine v3.22 | mercurial | 4.9-r0 | — |
| Alpine v3.21 | mercurial | 4.9-r0 | — |
| Alpine v3.20 | mercurial | 4.9-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mercurial | 4.9-r0 | — |
| Alpine v3.18 | mercurial | 4.9-r0 | — |
| Alpine v3.17 | mercurial | 4.9-r0 | — |
| Alpine v3.16 | mercurial | 4.9-r0 | — |
| Alpine v3.15 | mercurial | 4.9-r0 | — |
| Alpine v3.14 | mercurial | 4.9-r0 | — |
| Alpine v3.13 | mercurial | 4.9-r0 | — |
| Alpine v3.12 | mercurial | 4.9-r0 | — |
| Alpine v3.11 | mercurial | 4.9-r0 | — |
| Alpine v3.10 | mercurial | 4.9-r0 | — |
| Alpine v3.9 | mercurial | 4.9-r0 | — |
| Alpine v3.8 | mercurial | 4.6.1-r1 | — |
| Alpine v3.7 | mercurial | 4.5.2-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | mercurial | < 4.9 | 4.9 | GHSA-mq66-vcfc-8246 |
Advisories 10
- USN-5102-2 mercurial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- DLA-2293-1 mercurial - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1764-1 mercurial - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-5102-1 mercurial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2020:1709-1 Security update for mercurial SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0880-1 Security update for mercurial SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0869-1 Security update for mercurial SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3003-1 Security update for mercurial SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10586-1 mercurial-5.9.1-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1709-2 Security update for mercurial SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902
- [debian-lts-announce] 20190425 [SECURITY] [DLA 1764-1] mercurial security update mailing-list
- https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29
- USN-4086-1 vendor-advisory
- [debian-lts-announce] 20200731 [SECURITY] [DLA 2293-1] mercurial security update mailing-list