Description
Expat, when used in a parser that has not called XML_SetHashSalt or passed it a seed of 0, makes it easier for context-dependent attackers to defeat cryptographic protection mechanisms via vectors involving use of the srand function.
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 | 2.1.1-3 | — |
| Debian 13 | expat | 2.1.1-3 | — |
| Debian 12 | expat | 2.1.1-3 | — |
| Debian 12 | libxmltok | No fix yet | — |
| Debian 8 | expat | 2.1.0-6+deb8u3 | DSA-3597-1 |
| Debian 7 | expat | 2.1.0-1+deb7u4 | DLA-508-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | paraview +2 | No fix yet | — |
| Ubuntu 26.04 LTS | paraview +2 | No fix yet | — |
| Ubuntu 25.10 | paraview +2 | No fix yet | — |
| Ubuntu 18.04 LTS | vnc4 | No fix yet | — |
| Ubuntu 16.04 LTS | expat | 2.1.0-7ubuntu0.16.04.2 | USN-3010-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | expat | 2.1.0-4ubuntu1.3 | USN-3010-1 |
| Ubuntu Pro 24.04 LTS | xmlrpc-c | No fix yet | — |
| Ubuntu Pro 22.04 LTS | xmlrpc-c | No fix yet | — |
| Ubuntu Pro 20.04 LTS | xmlrpc-c | No fix yet | — |
| Ubuntu Pro 18.04 LTS | xmlrpc-c | No fix yet | — |
| Ubuntu Pro 16.04 LTS | vnc4 +2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | vnc4 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | expat | 2.1.0-20.2 | SUSE-SU-2017:0424-1 |
| SLES 12 SP1 | expat | 2.1.0-20.2 | SUSE-SU-2017:0424-1 |
| SLES 11 SP4 | expat | 2.0.1-88.41.1 | SUSE-SU-2017:0415-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Studio Onsite 1.3 | expat | 2.0.1-88.41.1 | SUSE-SU-2017:0415-1 |
| SLES for SAP 12 SP2 | expat | 2.1.0-20.2 | SUSE-SU-2017:0424-1 |
| SLES for SAP 12 SP1 | expat | 2.1.0-20.2 | SUSE-SU-2017:0424-1 |
| SLES for SAP 11 SP4 | expat | 2.0.1-88.41.1 | SUSE-SU-2017:0415-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.2.0-3.1 | openSUSE-SU-2024:10077-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.4 | expat | 2.2.0-r0 | — |
| Alpine v3.3 | expat | 2.2.0-r0 | — |
| Alpine v3.2 | expat | 2.2.0-r0 | — |
Advisories 6
- USN-3010-1 expat vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-508-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3597-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10077-1 expat-2.2.0-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:0424-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:0415-1 Security update for expat SUSE / openSUSE Security Updates · May 2, 2025
References
- https://www.tenable.com/security/tns-2016-20
- 91483 vdb-entry
- DSA-3597 vendor-advisory
- [oss-security] 20160603 Re: expat hash collision fix too predictable? mailing-list
- [oss-security] 20160603 Re: expat hash collision fix too predictable? mailing-list
- GLSA-201701-21 vendor-advisory
- https://source.android.com/security/bulletin/2016-11-01.html
- USN-3010-1 vendor-advisory