Description
In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.
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 | 2.5.0-1 | — |
| Debian 13 | expat | 2.5.0-1 | — |
| Debian 12 | expat | 2.5.0-1 | — |
| Debian 12 | libxmltok | No fix yet | — |
| Debian 11 | expat | 2.2.10-2+deb11u5 | DSA-5266-1 |
| Debian 10 | expat | 2.2.6-2+deb10u6 | DLA-3165-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tdom +6 | No fix yet | — |
| Ubuntu 26.04 LTS | tdom +5 | No fix yet | — |
| Ubuntu 25.10 | tdom +6 | No fix yet | — |
| Ubuntu 24.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 22.04 LTS | expat | 2.4.7-1ubuntu0.2 | USN-5638-3, USN-5638-2 |
| Ubuntu 22.04 LTS | tdom +4 | No fix yet | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | expat | 2.2.9-1ubuntu0.6 | USN-5638-3, USN-5638-2 |
| Ubuntu 20.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 18.04 LTS | expat | 2.2.5-3ubuntu0.8 | USN-5638-3, USN-5638-2 |
| Ubuntu 18.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 16.04 LTS | tdom +4 | 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 | swish-e +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | coin3 +2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | expat | 2.1.0-7ubuntu0.16.04.5+esm7 | USN-5638-3 |
| Ubuntu Pro 16.04 LTS | vtk +7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | expat | 2.1.0-4ubuntu1.4+esm7 | USN-5638-4 |
| Ubuntu Pro 14.04 LTS | vtk +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | expat +1 | 2.4.9-1.el9_1.1 | RHSA-2023:0337 |
| RHEL 8 | expat +1 | 2.2.5-10.el8_7.1 | RHSA-2023:0103 |
| RHEL 8 | firefox | 102.5.0-1.el8_7 | RHSA-2022:8554 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.6 EUS | expat +1 | 2.2.5-8.el8_6.4 | RHSA-2024:0421 |
| RHEL 8.6 EUS | firefox | 102.5.0-1.el8_6 | RHSA-2022:8548 |
| RHEL 8.4 EUS Long Life | expat | 2.2.10-1.el8_4 | RHSA-2025:22785 |
| RHEL 8.4 EUS | firefox | 102.5.0-1.el8_4 | RHSA-2022:8549 |
| RHEL 8.4 AUS | expat | 2.2.10-1.el8_4 | RHSA-2025:22785 |
| RHEL 8.2 TUS | firefox | 102.5.0-1.el8_2 | RHSA-2022:8550 |
| RHEL 8.2 E4S | firefox | 102.5.0-1.el8_2 | RHSA-2022:8550 |
| RHEL 8.2 AUS | expat | 2.2.10-1.el8_2 | RHSA-2025:22871 |
| RHEL 8.2 AUS | firefox | 102.5.0-1.el8_2 | RHSA-2022:8550 |
| RHEL 8.1 E4S | firefox | 102.5.0-1.el8_1 | RHSA-2022:8553 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | expat +1 | 2.4.9-1.el9_1.1 | ALSA-2023:0337 |
| AlmaLinux 8 | expat +1 | 2.2.5-10.el8_7.1 | ALSA-2023:0103 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | expat | 2.4.9-1.el9_1.1 | RLSA-2023:0337 |
| Rocky Linux 8 | expat | 2.2.5-10.el8_7.1 | RLSA-2023:0103 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 15 SP4 | expat | 2.4.4-150400.3.12.1 | SUSE-SU-2026:4623-1, SUSE-SU-2022:3884-1 |
| SLES 15 SP3 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLES 15 SP2 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
Show 32 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLES 15 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLES 12 SP5 | expat | 2.1.0-21.28.1 | SUSE-SU-2026:4615-1, SUSE-SU-2022:3874-1 |
| SLES 12 SP4 | expat | 2.1.0-21.28.1 | SUSE-SU-2022:3874-1 |
| SLES 12 SP3 | expat | 2.1.0-21.28.1 | SUSE-SU-2022:3874-1 |
| SLES 12 SP2 | expat | 2.1.0-21.28.1 | SUSE-SU-2022:3874-1 |
| SLES for SAP 15 SP6 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 15 SP2 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLES for SAP 15 SP1 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLES for SAP 15 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLES for SAP 12 SP5 | expat | 2.1.0-21.28.1 | SUSE-SU-2022:3874-1 |
| SLES for SAP 12 SP4 | expat | 2.1.0-21.28.1 | SUSE-SU-2022:3874-1 |
| SLE Micro 6.0 | expat | 2.8.5-159998.1.1 | SUSE-SU-2026:24323-1 |
| SLE Micro 5.5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE Micro 5.4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE Micro 5.3 | expat | 2.4.4-150400.3.12.1 | SUSE-SU-2026:4623-1, SUSE-SU-2022:3884-1 |
| SLE Micro 5.2 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLE Micro 5.1 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLE HPC 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE HPC 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE HPC 15 SP2 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLE HPC 15 SP1 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SLE HPC 15 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SUSE OpenStack Cloud Crowbar 9 | expat | 2.1.0-21.28.1 | SUSE-SU-2022:3874-1 |
| SUSE OpenStack Cloud 9 | expat | 2.1.0-21.28.1 | SUSE-SU-2022:3874-1 |
| SUSE Manager Server 4.1 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SUSE Manager Retail Branch Server 4.1 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SUSE Manager Proxy 4.1 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SUSE Enterprise Storage 7 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
| SUSE Enterprise Storage 6 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.5.0-1.1 | openSUSE-SU-2024:12449-1 |
| openSUSE Leap 15.4 | expat | 2.4.4-150400.3.12.1 | SUSE-SU-2022:3884-1 |
| openSUSE Leap 15.3 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | expat | 2.2.5-150000.3.25.1 | SUSE-SU-2022:3912-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.5.0-r0 | — |
| Alpine v3.23 | expat | 2.5.0-r0 | — |
| Alpine v3.22 | expat | 2.5.0-r0 | — |
| Alpine v3.21 | expat | 2.5.0-r0 | — |
| Alpine v3.20 | expat | 2.5.0-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | expat | 2.5.0-r0 | — |
| Alpine v3.18 | expat | 2.5.0-r0 | — |
| Alpine v3.17 | expat | 2.5.0-r0 | — |
| Alpine v3.16 | expat | 2.5.0-r0 | — |
| Alpine v3.15 | expat | 2.5.0-r0 | — |
| Alpine v3.14 | expat | 2.5.0-r0 | — |
| Alpine v3.13 | expat | 2.2.10-r8 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | expat +2 | 2.5.0-1.amzn2023.0.2 | ALAS2023-2023-058 |
| Amazon Linux 2 | expat +2 | 2.1.0-15.amzn2.0.2 | ALAS2-2022-1885 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | expat | 2.5.0-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | expat +1 | 2.4.9-1.el9_1.1 | ELSA-2023-0337 |
| Oracle Linux 8 | expat +1 | 2.2.5-10.0.1.el8_7.1 | ELSA-2023-0103 |
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
-
nidhihcl/external_expat_2.1.0_CVE-2022-43680 ★ 0 · Dec 19, 2022
-
Trinadh465/external_expat-2.1.0_CVE-2022-43680 ★ 0 · Dec 15, 2022
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 50
- ALSA-2023:0337 Moderate: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:0103 Moderate: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- SUSE-SU-2026:24323-1 Security update for expat SUSE / openSUSE Security Updates · Oct 27, 2026
- WID-SEC-2022-1844 expat: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 25, 2026
- RHSA-2025:22871 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2025:22785 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2024:0421 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:0337 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:0103 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:8553 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:8554 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:8549 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:8550 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:8548 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SUSE-SU-2026:4623-1 Security update for expat SUSE / openSUSE Security Updates · Oct 13, 2026
- SUSE-SU-2026:4615-1 Security update for expat SUSE / openSUSE Security Updates · Oct 13, 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-2026-2912 Dell PowerScale OneFS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2026-2355 Dell integrated Dell Remote Access Controller: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 14, 2026
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- USN-5638-4 expat vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5638-3 expat vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5638-2 expat vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5266-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3165-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:0337 Moderate: expat security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2023:0103 Moderate: expat security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:12449-1 expat-2.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3912-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3874-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1542 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- VDE-2023-001 PHOENIX CONTACT: Multiple Vulnerabilities in PLCnext Firmware CERT@VDE · Jun 5, 2025
- VDE-2022-058 PHOENIX CONTACT: Profinet SDK libexpat vulnerabilities CERT@VDE · May 14, 2025
- ICSA-23-131-05 Siemens SINEC NMS Third-Party CISA ICS & IT advisories · May 6, 2025
- SUSE-SU-2022:3884-1 Security update for expat SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-3226 Apache OpenOffice: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 28, 2023
- WID-SEC-2023-1807 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 26, 2023
- WID-SEC-2023-2676 Oracle Enterprise Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 17, 2023
- WID-SEC-2023-1818 Oracle Database Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 18, 2023
- WID-SEC-2023-0292 Android Patchday Februar 2023 BSI CERT-Bund (WID) · Jun 1, 2023
- ICSA-23-143-01 Hitachi Energy’s AFS65x, AFS67x, AFR67x and AFF66x Products CISA ICS & IT advisories · May 31, 2023
- WID-SEC-2023-0561 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 18, 2023
- SSA-892048 SSA-892048: Third-Party Component Vulnerabilities in SINEC NMS before V1.0.3.1 Siemens ProductCERT · May 9, 2023
- WID-SEC-2023-0132 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 1, 2023
- WID-SEC-2023-1017 Oracle Financial Services Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 18, 2023
- ALAS2023-2023-058 Critical: expat security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
- ELSA-2023-0337 Moderate: expat security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jan 24, 2023
- WID-SEC-2022-2372 genua genugate: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 19, 2023
References
- https://github.com/libexpat/libexpat/pull/650
- https://github.com/libexpat/libexpat/issues/649
- https://github.com/libexpat/libexpat/pull/616
- [debian-lts-announce] 20221028 [SECURITY] [DLA 3165-1] expat security update mailing-list
- DSA-5266 vendor-advisory
- GLSA-202210-38 vendor-advisory
- FEDORA-2022-ae2559a8f4 vendor-advisory
- FEDORA-2022-3cf0e7ebc7 vendor-advisory
- FEDORA-2022-f3a939e960 vendor-advisory
- FEDORA-2022-5f1e2e9016 vendor-advisory
- FEDORA-2022-49db80f821 vendor-advisory
- FEDORA-2022-c43235716e vendor-advisory
- https://security.netapp.com/advisory/ntap-20221118-0007/
- [oss-security] 20231228 CVE-2022-43680: Apache OpenOffice: "Use after free" fixed in libexpat mailing-list
- [oss-security] 20240103 CVE-2022-43680: Apache OpenOffice: "Use after free" fixed in libexpat mailing-list