Description
An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
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 | 2.6.2-2 | — |
| Debian 13 | expat | 2.6.2-2 | — |
| Debian 12 | expat | 2.5.0-1+deb12u1 | DSA-5770-1 |
| Debian 12 | libxmltok | No fix yet | — |
| Debian 11 | expat | 2.2.10-2+deb11u6 | DLA-3893-1 |
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 | 2.6.1-2ubuntu0.1 | USN-7000-1 |
| Ubuntu 24.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 22.04 LTS | expat | 2.4.7-1ubuntu0.4 | USN-7000-2 |
| 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 | 2.2.9-1ubuntu0.7 | USN-7000-1 |
| 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 | libxmltok | 1.2-4.1ubuntu2.24.0.4.1+esm1 | USN-7001-2 |
| Ubuntu Pro 24.04 LTS | swish-e +1 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | libxmltok | 1.2-4ubuntu0.22.04.1~esm3 | USN-7001-1 |
| Ubuntu Pro 22.04 LTS | swish-e +1 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | libxmltok | 1.2-4ubuntu0.20.04.1~esm3 | USN-7001-1 |
| Ubuntu Pro 20.04 LTS | swish-e +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | coin3 +2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | expat | 2.2.5-3ubuntu0.9+esm1 | USN-7000-1 |
| Ubuntu Pro 18.04 LTS | libxmltok | 1.2-4ubuntu0.18.04.1~esm3 | USN-7001-1 |
| Ubuntu Pro 16.04 LTS | expat | 2.1.0-7ubuntu0.16.04.5+esm9 | USN-7000-1 |
| Ubuntu Pro 16.04 LTS | libxmltok | 1.2-3ubuntu0.16.04.1~esm4 | USN-7001-1 |
| Ubuntu Pro 16.04 LTS | vtk +6 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | expat | 2.1.0-4ubuntu1.4+esm9 | USN-7000-1 |
| Ubuntu Pro 14.04 LTS | vtk +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | expat +1 | 2.5.0-2.el9_4.1 | RHSA-2024:6754 |
| RHEL 8 | expat +1 | 2.2.5-15.el8_10 | RHSA-2024:6989 |
| RHEL 8 | xmlrpc-c +4 | 1.51.0-10.el8_10 | RHSA-2024:8859 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | expat +1 | 2.5.0-2.el9_4.1 | ALSA-2024:6754 |
| AlmaLinux 8 | expat +1 | 2.2.5-15.el8_10 | ALSA-2024:6989 |
| AlmaLinux 8 | xmlrpc-c +4 | 1.51.0-10.el8_10 | ALSA-2024:8859 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | expat | 2.5.0-2.el9_4.1 | RLSA-2024:6754 |
| Rocky Linux 8 | expat | 2.2.5-15.el8_10 | RLSA-2024:6989 |
| Rocky Linux 8 | xmlrpc-c | 1.51.0-10.el8_10 | RLSA-2024:8859 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | mozjs52 | 52.6.0-150000.3.9.1 | SUSE-SU-2025:4512-1 |
| SLES 15 SP7 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLES 15 SP6 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLES 15 SP6 | mozjs115 | 115.4.0-150600.3.3.1 | SUSE-SU-2024:3538-1 |
| SLES 15 SP6 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
| SLES 15 SP5 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLES 15 SP5 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
| SLES 12 SP5 | expat | 2.1.0-21.37.1 | SUSE-SU-2024:3182-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | expat | 2.1.0-21.37.1 | SUSE-SU-2024:3182-1 |
| 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 | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLE Micro 5.4 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLE Micro 5.4 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLE Micro 5.3 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLE Micro 5.3 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLE Micro 5.2 | expat | 2.2.5-150000.3.30.1 | SUSE-SU-2024:3515-1 |
| SLE Micro 5.2 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLE Micro 5.1 | expat | 2.2.5-150000.3.30.1 | SUSE-SU-2024:3515-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.6.3-1.1 | openSUSE-SU-2024:14322-1 |
| openSUSE Tumbleweed | mozjs115 | 115.4.0-5.1 | openSUSE-SU-2024:14379-1 |
| openSUSE Tumbleweed | mozjs128 | 128.2.0-2.1 | openSUSE-SU-2024:14380-1 |
| openSUSE Tumbleweed | mozjs78 | 78.15.0-5.1 | openSUSE-SU-2024:14381-1 |
| openSUSE Tumbleweed | x3270 | 4.3-4.1 | openSUSE-SU-2024:14328-1 |
| openSUSE Leap 15.6 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| openSUSE Leap 15.6 | mozjs115 | 115.4.0-150600.3.3.1 | SUSE-SU-2024:3538-1 |
| openSUSE Leap 15.6 | mozjs52 | 52.6.0-150000.3.9.1 | SUSE-SU-2025:4512-1 |
| openSUSE Leap 15.6 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| openSUSE Leap 15.6 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
| openSUSE Leap 15.5 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| openSUSE Leap 15.5 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.5 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.6.3-r0 | — |
| Alpine v3.24 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.23 | expat | 2.6.3-r0 | — |
| Alpine v3.23 | qt5-qtwebengine | 5.15.17-r3 | — |
| Alpine v3.23 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.22 | expat | 2.6.3-r0 | — |
| Alpine v3.22 | qt5-qtwebengine | 5.15.17-r3 | — |
| Alpine v3.22 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.21 | expat | 2.6.3-r0 | — |
| Alpine v3.21 | qt5-qtwebengine | 5.15.17-r3 | — |
| Alpine v3.21 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.20 | expat | 2.6.3-r0 | — |
| Alpine v3.20 | qt5-qtwebengine | 5.15.16-r12 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | expat | 2.6.3-r0 | — |
| Alpine v3.18 | expat | 2.6.3-r0 | — |
| Alpine v3.17 | expat | 2.6.3-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | expat | 2.6.3-1 | — |
| Azure Linux 2 (CBL-Mariner) | expat | 2.6.3-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | expat +1 | 2.5.0-2.el9_4.1 | ELSA-2024-6754 |
| Oracle Linux 8 | expat +1 | 2.2.5-15.0.1.el8_10 | ELSA-2024-6989 |
| Oracle Linux 8 | xmlrpc-c +4 | 1.51.0-10.el8_10 | ELSA-2024-8859 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | expat | 2.6.3-r0 | — |
Advisories 48
- ALSA-2024:6754 Moderate: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:8859 Moderate: xmlrpc-c security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:6989 Moderate: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:6989 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2024:6754 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-0001 IBM DB2: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2024:8859 Red Hat Security Advisory: xmlrpc-c security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- ICSA-25-259-02 Hitachi Energy RTU500 Series CISA ICS & IT advisories · Oct 8, 2026
- WID-SEC-2024-1951 expat: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Sep 15, 2026
- USN-7000-1 expat vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-7001-1 libxmltok vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- USN-7001-2 libxmltok vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-7000-2 expat vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:4512-1 Security update for mozjs52 SUSE / openSUSE Security Updates · Mar 23, 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
- DSA-5770-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3893-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ICSA-25-226-15 Siemens SINEC OS CISA ICS & IT advisories · Feb 25, 2026
- SSA-613116 SSA-613116: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.1 Siemens ProductCERT · Feb 24, 2026
- RLSA-2024:6989 Moderate: expat security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:8859 Moderate: xmlrpc-c security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:6754 Moderate: expat security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2026:0044-1 Security update for mozjs60 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14380-1 libmozjs-128-0-128.2.0-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14328-1 x3270-4.3-4.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3554-1 Security update for mozjs78 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3538-1 Security update for mozjs115 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14322-1 expat-2.6.3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14379-1 libmozjs-115-0-115.4.0-5.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3216-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3182-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3515-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2025-0187 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jun 10, 2025
- openSUSE-SU-2024:14381-1 libmozjs-78-0-78.15.0-5.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- NCSC-2025-0027 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0025 Kwetsbaarheden verholpen in Oracle Financial Services NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0021 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0020 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Jan 22, 2025
- WID-SEC-2024-3684 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 11, 2024
- ICSA-24-317-01 Subnet Solutions PowerSYSTEM Center CISA ICS & IT advisories · Nov 12, 2024
- ELSA-2024-8859 Moderate: xmlrpc-c security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 5, 2024
- NCSC-2024-0411 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Oct 17, 2024
- ELSA-2024-6989 Moderate: expat security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 24, 2024
- ELSA-2024-6754 Moderate: expat security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 18, 2024