critical
CVE-2017-18206
zsh: buffer overrun in symlinks
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat7.5CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD, Photon OS. Rated lower by Oracle (medium), Ubuntu (medium), Red Hat (low), Amazon (low).
Description
In utils.c in zsh before 5.4, symlink expansion had a buffer overflow.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| Photon OS 2.0 | zsh | 5.3.1-10.ph2 |
| amazon linux 1 | zsh, zsh-debuginfo, zsh-html | 5.0.2-31.17.amzn1 |
| amazon linux 2 | zsh, zsh-debuginfo, zsh-html | 5.3.1-7.amzn2 |
| debian 11 | zsh | 5.4.1-1 |
| debian 12 | zsh | 5.4.1-1 |
| debian 13 | zsh | 5.4.1-1 |
| debian 14 | zsh | 5.4.1-1 |
| debian 7 | zsh | 4.3.17-1+deb7u1 |
| debian 8 | zsh | no fix listed |
| debian 9 | zsh | 5.3.1-4+deb9u1 |
| echo | zsh | 5.4.1-1 |
| Oracle Linux 6 | zsh, zsh-html | 4.3.11-8.el6 |
Show all 22 entries from 16 sources
| Source | Package | Fixed in |
|---|---|---|
| Photon OS 2.0 | zsh | 5.3.1-10.ph2 |
| amazon linux 1 | zsh | 5.0.2-31.17.amzn1 |
| amazon linux 1 | zsh-debuginfo | 5.0.2-31.17.amzn1 |
| amazon linux 1 | zsh-html | 5.0.2-31.17.amzn1 |
| amazon linux 2 | zsh | 5.3.1-7.amzn2 |
| amazon linux 2 | zsh-debuginfo | 5.3.1-7.amzn2 |
| amazon linux 2 | zsh-html | 5.3.1-7.amzn2 |
| debian 11 | zsh | 5.4.1-1 |
| debian 12 | zsh | 5.4.1-1 |
| debian 13 | zsh | 5.4.1-1 |
| debian 14 | zsh | 5.4.1-1 |
| debian 7 | zsh | 4.3.17-1+deb7u1 |
| debian 8 | zsh | no fix listed |
| debian 9 | zsh | 5.3.1-4+deb9u1 |
| echo | zsh | 5.4.1-1 |
| Oracle Linux 6 | zsh | 4.3.11-8.el6 |
| Oracle Linux 6 | zsh-html | 4.3.11-8.el6 |
| Oracle Linux 7 | zsh | 5.0.2-31.el7 |
| Oracle Linux 7 | zsh-html | 5.0.2-31.el7 |
| ubuntu 16.04 | zsh | 5.1.1-1ubuntu2.1 |
| ubuntu 16.04-ESM | zsh | 5.1.1-1ubuntu2.1 |
| ubuntu 17.10 | zsh | 5.2-5ubuntu1.1 |
References
- https://access.redhat.com/errata/RHSA-2018:1932
- https://access.redhat.com/errata/RHSA-2018:3073
- https://access.redhat.com/security/cve/CVE-2017-18206
- https://linux.oracle.com/cve/CVE-2017-18206.html
- https://linux.oracle.com/errata/ELSA-2018-3073.html
- https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html
- https://nvd.nist.gov/vuln/detail/CVE-2017-18206
- https://security.gentoo.org/glsa/201805-10