Description
In params.c in zsh through 5.4.2, there is a crash during a copy of an empty hash table, as demonstrated by typeset -p.
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 | 5.5-1 | — |
| Debian 13 | zsh | 5.5-1 | — |
| Debian 12 | zsh | 5.5-1 | — |
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 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | zsh +1 | 5.0.2-31.el7 | RHSA-2018:3073 |
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 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | zsh +1 | 5.3.1-7.amzn2 | ALAS2-2018-986 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | zsh +1 | 5.0.2-31.el7 | ELSA-2018-3073 |
Advisories 6
- RHSA-2018:3073 Red Hat Security Advisory: zsh security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-3593-1 zsh vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 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
- ELSA-2018-3073 Moderate: zsh security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 5, 2018
- ALAS2-2018-986 Low: zsh security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 5, 2018
References
- USN-3593-1 vendor-advisory
- GLSA-201805-10 vendor-advisory
- https://sourceforge.net/p/zsh/code/ci/c2cc8b0fbefc9868fa83537f5b6d90fc1ec438dd
- RHSA-2018:3073 vendor-advisory