Description
libexpat through 2.5.0 allows recursive XML Entity Expansion if XML_DTD is undefined at compile time.
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 | 2.6.0-1 | — |
| Debian 13 | expat | 2.6.0-1 | — |
| Debian 12 | expat +1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tdom +5 | No fix yet | — |
| Ubuntu 26.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 25.10 | tdom +5 | No fix yet | — |
| Ubuntu 24.04 LTS | expat | 2.6.0-1 | — |
| Ubuntu 24.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 22.04 LTS | tdom +3 | No fix yet | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 18.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 16.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu Pro 26.04 LTS | swish-e | No fix yet | — |
| Ubuntu Pro 24.04 LTS | swish-e +1 | 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 | vtk +4 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | vtk +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | expat | 2.7.1-slfo.1.1_1.1 | SUSE-SU-2025:20311-1 |
| SLE Micro 6.0 | expat | 2.7.1-1.1 | SUSE-SU-2025:20207-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.6.0-1.1 | openSUSE-SU-2024:13695-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.6.0-r0 | — |
| Alpine v3.23 | expat | 2.6.0-r0 | — |
| Alpine v3.22 | expat | 2.6.0-r0 | — |
| Alpine v3.21 | expat | 2.6.0-r0 | — |
| Alpine v3.20 | expat | 2.6.0-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | expat | 2.6.0-r0 | — |
| Alpine v3.18 | expat | 2.6.0-r0 | — |
| Alpine v3.17 | expat | 2.6.0-r0 | — |
| Alpine v3.16 | expat | 2.6.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | expat +2 | 2.5.0-1.amzn2023.0.3 | ALAS2023-2024-524 |
| Amazon Linux 2023 | xmlrpc-c +5 | 1.51.08-2.amzn2023.0.2 | ALAS2023-2025-1229 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | expat | 2.6.2-1 | — |
| Azure Linux 2 (CBL-Mariner) | expat | 2.6.2-2 | — |
Advisories 17
- WID-SEC-2024-0278 expat: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Oct 25, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-1439 Dell Secure Connect Gateway: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2026-2912 Dell PowerScale OneFS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026
- WID-SEC-2026-2355 Dell integrated Dell Remote Access Controller: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 14, 2026
- SUSE-SU-2025:20311-1 Security update for expat SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20207-1 Security update for expat SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2024:13695-1 expat-2.6.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2023-2025-1229 Important: xmlrpc-c security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 27, 2025
- WID-SEC-2024-3377 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 12, 2025
- WID-SEC-2025-0225 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- NCSC-2024-0411 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Oct 17, 2024
- NCSC-2024-0332 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Aug 13, 2024
- ICSA-24-228-06 Siemens SINEC NMS CISA ICS & IT advisories · Aug 13, 2024
- SSA-784301 SSA-784301: Multiple Vulnerabilities in SINEC NMS Before V3.0 Siemens ProductCERT · Aug 13, 2024
- ALAS2023-2024-524 Moderate: expat security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 19, 2024
References
- https://github.com/libexpat/libexpat/pull/777
- https://github.com/libexpat/libexpat/commit/0f075ec8ecb5e43f8fdca5182f8cca4703da0404
- https://cwe.mitre.org/data/definitions/776.html
- FEDORA-2024-fbe1f0c1aa vendor-advisory
- FEDORA-2024-b8656bc059 vendor-advisory
- https://security.netapp.com/advisory/ntap-20240307-0005/