Description
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
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 | 2.6.1-2 | — |
| Debian 13 | expat | 2.6.1-2 | — |
| Debian 12 | expat | 2.5.0-1+deb12u4 | — |
| Debian 12 | libxmltok | 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 | tdom +4 | No fix yet | — |
| Ubuntu 22.04 LTS | expat | 2.4.7-1ubuntu0.3 | USN-6694-1 |
| Ubuntu 22.04 LTS | tdom +5 | No fix yet | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 18.04 LTS | gdcm +7 | No fix yet | — |
| Ubuntu 16.04 LTS | gdcm +6 | 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 +1 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | expat +3 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | coin3 +4 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | vtk +8 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | vtk +4 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | expat +1 | 2.5.0-1.el9_3.1 | RHSA-2024:1530, RHBA-2024:2518 |
| RHEL 8 | expat +1 | 2.5.0-1.el8_10 | RHSA-2025:21776 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | expat +1 | 2.5.0-1.el9_2.1 | RHSA-2024:3926 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | expat +1 | 2.5.0-1.el9_3.1 | ALSA-2024:1530 |
| AlmaLinux 8 | expat +1 | 2.5.0-1.el8_10 | ALSA-2025:21776 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
| SLES 15 SP4 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
| SLE Micro 6.1 | expat | 2.7.1-slfo.1.1_1.1 | SUSE-SU-2025:20311-1 |
| SLE Micro 6.0 | expat | 2.5.0-3.1 | SUSE-SU-2025:20207-1, SUSE-SU-2025:20045-1 |
| SLE Micro 5.5 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-2, SUSE-SU-2024:1129-1 |
| SLE Micro 5.4 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
| SLE Micro 5.3 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
| SLE HPC 15 SP4 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
| SUSE Manager Server 4.3 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
| SUSE Manager Proxy 4.3 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.6.2-1.1 | openSUSE-SU-2024:13779-1 |
| openSUSE Leap 15.5 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
| openSUSE Leap Micro 5.3 | expat | 2.4.4-150400.3.17.1 | SUSE-SU-2024:1129-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.6.2-r0 | — |
| Alpine v3.23 | expat | 2.6.2-r0 | — |
| Alpine v3.22 | expat | 2.6.2-r0 | — |
| Alpine v3.21 | expat | 2.6.2-r0 | — |
| Alpine v3.20 | expat | 2.6.2-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | expat | 2.6.2-r0 | — |
| Alpine v3.18 | expat | 2.6.2-r0 | — |
| Alpine v3.17 | expat | 2.6.2-r0 | — |
| Alpine v3.16 | expat | 2.6.2-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | expat +2 | 2.5.0-1.amzn2023.0.4 | ALAS2023-2024-576 |
| 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 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | expat +1 | 2.5.0-1.el9_3.1 | ELSA-2024-1530 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | expat | 2.6.2-r0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 2 repositories
-
RenukaSelvar/expat_CVE-2024-28757 ★ 0 · May 3, 2024
-
saurabh2088/expat_2_1_0_CVE-2024-28757 ★ 0 · May 3, 2024
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 30
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- ALSA-2024:1530 Moderate: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:21776 Important: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2024-0591 expat: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 21, 2026
- RHSA-2025:21776 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2024:3926 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2024:1530 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHBA-2024:2518 Red Hat Bug Fix Advisory: expat bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 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
- ICSA-25-259-02 Hitachi Energy RTU500 Series CISA ICS & IT advisories · Oct 8, 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
- USN-6694-1 expat vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:20045-1 Security update for expat SUSE / openSUSE Security Updates · Mar 23, 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
- SUSE-SU-2024:1129-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13779-1 expat-2.6.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1129-2 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1360 IBM DB2: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 25, 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-2024-1474 Red Hat OpenShift Container Platform: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 26, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- NCSC-2025-0020 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2024-0332 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Aug 13, 2024
- SSA-784301 SSA-784301: Multiple Vulnerabilities in SINEC NMS Before V3.0 Siemens ProductCERT · Aug 13, 2024
- ICSA-24-228-06 Siemens SINEC NMS CISA ICS & IT advisories · Aug 13, 2024
- ALAS2023-2024-576 Important: expat security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 27, 2024
- ELSA-2024-1530 Moderate: expat security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
References
- https://github.com/libexpat/libexpat/pull/842
- https://github.com/libexpat/libexpat/issues/839
- FEDORA-2024-4e6e660fae vendor-advisory
- FEDORA-2024-40b98c9ced vendor-advisory
- https://security.netapp.com/advisory/ntap-20240322-0001/
- FEDORA-2024-afb73e6f62 vendor-advisory
- [oss-security] 20240315 Expat 2.6.2 released, includes security fixes mailing-list