Description
XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.
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 | expat | 2.2.1-1 | — |
| Debian 13 | expat | 2.2.1-1 | — |
| Debian 12 | expat | 2.2.1-1 | — |
| Debian 12 | libxmltok | No fix yet | — |
| Debian 9 | expat | 2.2.0-2+deb9u1 | DSA-3898-1 |
| Debian 8 | expat | 2.1.0-6+deb8u4 | DSA-3898-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | expat | 2.1.0-1+deb7u5 | DLA-990-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | matanza +2 | No fix yet | — |
| Ubuntu 26.04 LTS | matanza +1 | No fix yet | — |
| Ubuntu 25.10 | matanza +2 | No fix yet | — |
| Ubuntu 24.04 LTS | matanza | No fix yet | — |
| Ubuntu 22.04 LTS | matanza | No fix yet | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | matanza | No fix yet | — |
| Ubuntu 18.04 LTS | vnc4 +1 | No fix yet | — |
| Ubuntu 16.04 LTS | expat | 2.1.0-7ubuntu0.16.04.3 | USN-3356-1 |
| Ubuntu 16.04 LTS | matanza +1 | No fix yet | — |
| Ubuntu 14.04 LTS | expat | 2.1.0-4ubuntu1.4 | USN-3356-1 |
| Ubuntu Pro 26.04 LTS | swish-e | No fix yet | — |
| Ubuntu Pro 24.04 LTS | swish-e | No fix yet | — |
| Ubuntu Pro 22.04 LTS | swish-e | No fix yet | — |
| Ubuntu Pro 20.04 LTS | swish-e | No fix yet | — |
| Ubuntu Pro 18.04 LTS | coin3 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | coin3 | 3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1 | USN-4825-1 |
| Ubuntu Pro 16.04 LTS | vnc4 +2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | coin3 | 3.1.4~abc9f50-4ubuntu2+esm1 | USN-4825-1 |
| Ubuntu Pro 14.04 LTS | vnc4 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP5 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 SP4 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP4 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 SP3 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES 12 SP3 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP3 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 SP2 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES 12 SP2 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP2 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 SP1 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP1 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 11 SP4 | expat | 2.0.1-88.42.3.2 | SUSE-SU-2017:2375-1 |
| SUSE Studio Onsite 1.3 | expat | 2.0.1-88.42.3.2 | SUSE-SU-2017:2375-1 |
| SLES for SAP 12 SP5 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP5 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP4 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP4 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP3 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES for SAP 12 SP3 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP3 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP2 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES for SAP 12 SP2 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP2 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP1 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP1 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 11 SP4 | expat | 2.0.1-88.42.3.2 | SUSE-SU-2017:2375-1 |
| SUSE OpenStack Cloud Crowbar 8 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud Crowbar 8 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 8 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 8 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 7 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 7 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE HPE Helion OpenStack 8 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE HPE Helion OpenStack 8 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE Enterprise Storage 5 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE Enterprise Storage 5 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.4.1-1.2 | openSUSE-SU-2024:10748-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.2.0-r1 | — |
| Alpine v3.23 | expat | 2.2.0-r1 | — |
| Alpine v3.22 | expat | 2.2.0-r1 | — |
| Alpine v3.21 | expat | 2.2.0-r1 | — |
| Alpine v3.20 | expat | 2.2.0-r1 | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | expat | 2.2.0-r1 | — |
| Alpine v3.18 | expat | 2.2.0-r1 | — |
| Alpine v3.17 | expat | 2.2.0-r1 | — |
| Alpine v3.16 | expat | 2.2.0-r1 | — |
| Alpine v3.15 | expat | 2.2.0-r1 | — |
| Alpine v3.14 | expat | 2.2.0-r1 | — |
| Alpine v3.13 | expat | 2.2.0-r1 | — |
| Alpine v3.12 | expat | 2.2.0-r1 | — |
| Alpine v3.11 | expat | 2.2.0-r1 | — |
| Alpine v3.10 | expat | 2.2.0-r1 | — |
| Alpine v3.9 | expat | 2.2.0-r1 | — |
| Alpine v3.8 | expat | 2.2.0-r1 | — |
| Alpine v3.7 | expat | 2.2.0-r1 | — |
| Alpine v3.6 | expat | 2.2.0-r1 | — |
| Alpine v3.5 | expat | 2.2.0-r1 | — |
| Alpine v3.4 | expat | 2.2.0-r1 | — |
Advisories 12
- USN-4825-1 coin3 vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-3356-1 expat vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-990-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3898-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2299-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2375-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10748-1 expat-2.4.1-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0497-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- VDE-2019-009 PHOENIX CONTACT: Multiple Vulnerabilities in AXC F 2152 CERT@VDE · May 22, 2025
- WID-SEC-2025-0370 Apple Mac OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 13, 2025
- WID-SEC-2022-2037 expat: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 5, 2023
- ICSA-19-155-01 PHOENIX CONTACT PLCNext AXC F 2152 CISA ICS & IT advisories · Jun 4, 2019
References
- https://support.apple.com/HT208144
- https://libexpat.github.io/doc/cve-2017-9233/
- https://github.com/libexpat/libexpat/blob/master/expat/Changes
- 1039427 vdb-entry
- https://support.apple.com/HT208113
- https://support.apple.com/HT208112
- https://support.apple.com/HT208115
- DSA-3898 vendor-advisory
- 99276 vdb-entry
- [oss-security] 20170618 Expat 2.2.1 security fixes mailing-list
- https://support.f5.com/csp/article/K03244804
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list