Description
Info-ZIP UnZip 6.0 mishandles the overlapping of files inside a ZIP container, leading to denial of service (resource consumption), aka a "better zip bomb" issue.
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 | unzip | 6.0-24 | — |
| Debian 13 | unzip | 6.0-24 | — |
| Debian 12 | unzip | 6.0-24 | — |
| Debian 8 | unzip | 6.0-16+deb8u4 | DLA-1846-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | unzip | 6.0-21ubuntu1.1 | USN-4672-1 |
| Ubuntu 16.04 LTS | unzip | 6.0-20ubuntu1.1 | USN-4672-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | unzip | 6.0-9ubuntu1.6 | USN-4672-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | unzip | 6.0-43.el8 | RHSA-2020:1787 |
| RHEL 7 | unzip | 6.0-21.el7 | RHSA-2020:1181 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.7 EUS | unzip | 6.0-20.el7_7.1 | RHSA-2020:2486 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | unzip | 6.0-r7 | — |
| Alpine v3.23 | unzip | 6.0-r7 | — |
| Alpine v3.22 | unzip | 6.0-r7 | — |
| Alpine v3.21 | unzip | 6.0-r7 | — |
| Alpine v3.20 | unzip | 6.0-r7 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | unzip | 6.0-r7 | — |
| Alpine v3.18 | unzip | 6.0-r7 | — |
| Alpine v3.17 | unzip | 6.0-r7 | — |
| Alpine v3.16 | unzip | 6.0-r7 | — |
| Alpine v3.15 | unzip | 6.0-r7 | — |
| Alpine v3.14 | unzip | 6.0-r7 | — |
| Alpine v3.13 | unzip | 6.0-r7 | — |
| Alpine v3.12 | unzip | 6.0-r7 | — |
| Alpine v3.11 | unzip | 6.0-r6 | — |
| Alpine v3.10 | unzip | 6.0-r6 | — |
| Alpine v3.9 | unzip | 6.0-r6 | — |
| Alpine v3.8 | unzip | 6.0-r6 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | unzip | 6.0-68.amzn2023.0.1 | ALAS2023-2026-1422 |
| Amazon Linux 2 | unzip | 6.0-21.amzn2 | ALAS2-2020-1550 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | unzip | 6.0-20 | — |
| Azure Linux 2 (CBL-Mariner) | unzip | 6.0-19 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | unzip | 6.0-43.el8 | ELSA-2020-1787 |
| Oracle Linux 7 | unzip | 6.0-21.el7 | ELSA-2020-1181 |
Advisories 11
- WID-SEC-2026-4026 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- USN-4672-1 unzip vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- RHSA-2020:2486 Red Hat Security Advisory: unzip security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:1181 Red Hat Security Advisory: unzip security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DLA-1846-1 unzip - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ALAS2023-2026-1422 Low: unzip security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 5, 2026
- RHSA-2020:1787 Red Hat Security Advisory: unzip security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- VDE-2025-053 Phoenix Contact: Multiple Vulnerabilities in PLCnext Firmware CERT@VDE · Jul 8, 2025
- ALAS2-2020-1550 Low: unzip security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 22, 2020
- ELSA-2020-1787 Low: unzip security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 5, 2020
- ELSA-2020-1181 Low: unzip security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 6, 2020
References
- https://www.bamsoftware.com/hacks/zipbomb/
- https://github.com/madler/unzip
- [debian-lts-announce] 20190707 [SECURITY] [DLA 1846-1] unzip security update mailing-list
- [debian-lts-announce] 20190728 [SECURITY] [DLA 1846-2] unzip regression update mailing-list
- https://security.netapp.com/advisory/ntap-20190814-0002/
- https://support.f5.com/csp/article/K80311892?utm_source=f5support&%3Butm_medium=RSS
- GLSA-202003-58 vendor-advisory