Description
In zsh before 5.3, an off-by-one error resulted in undersized buffers that were intended to support PATH_MAX characters.
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 | zsh | 5.3-1 | — |
| Debian 13 | zsh | 5.3-1 | — |
| Debian 12 | zsh | 5.3-1 | — |
| Debian 7 | zsh | 4.3.17-1+deb7u1 | DLA-1304-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | zsh | 5.1.1-1ubuntu2.1 | USN-3593-1 |
| Ubuntu 14.04 LTS | zsh | 5.0.2-3ubuntu6.1 | USN-3593-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | zsh | 5.0.5-6.7.2 | SUSE-SU-2018:1072-1 |
| SLES 11 SP4 | zsh | 4.3.6-67.9.8.1 | SUSE-SU-2022:14910-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | zsh | 5.0.5-6.7.2 | SUSE-SU-2018:1072-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | zsh | 4.3.6-67.9.8.1 | SUSE-SU-2022:14910-1 |
Advisories 4
- USN-3593-1 zsh vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1304-1 zsh - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:1072-1 Security update for zsh SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:14910-1 Security update for zsh SUSE / openSUSE Security Updates · Feb 4, 2026