Description
The mpatch_decode function in mpatch.c in Mercurial before 4.6.1 mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data, but actually are not, aka OVE-20180430-0001.
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 | 4.6.1-1 | — |
| Debian 13 | mercurial | 4.6.1-1 | — |
| Debian 12 | mercurial | 4.6.1-1 | — |
| Debian 9 | mercurial | 4.0-1+deb9u2 | DLA-2293-1 |
| Debian 8 | mercurial | 3.1.2-2+deb8u5 | DLA-1414-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | mercurial | 4.5.3-1ubuntu2.1 | — |
| Ubuntu 16.04 LTS | mercurial | 3.7.3-1ubuntu1.1 | — |
| Ubuntu 14.04 LTS | mercurial | 2.8.2-1ubuntu1.4 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | mercurial | 4.5.2-3.3.1 | SUSE-SU-2018:1998-1 |
| SLES 12 SP3 | mercurial | 2.8.2-15.13.1 | SUSE-SU-2018:1990-1 |
| SLES 11 SP4 | mercurial | 2.3.2-0.18.9.1 | SUSE-SU-2018:1996-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mercurial | 5.9.1-2.1 | openSUSE-SU-2024:10586-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | mercurial | < 4.6.1 | 4.6.1 | GHSA-3v62-ww8w-758m |
Advisories 6
- DLA-2293-1 mercurial - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1414-1 mercurial - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:1998-1 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-2018:1996-1 Security update for mercurial SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1990-1 Security update for mercurial SUSE / openSUSE Security Updates · Feb 4, 2026