Description
libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| libexpat project | libexpat | < 2.7.5 | 2.7.5 |
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 | 2.7.5-1 | — |
| Debian 13 | expat | 2.8.2-1~deb13u1 | — |
| Debian 12 | expat | 2.5.0-1+deb12u4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tdom +5 | No fix yet | — |
| Ubuntu 26.04 LTS | expat | 2.7.4-1ubuntu0.1 | USN-8790-1 |
| Ubuntu 26.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 25.10 | tdom +6 | No fix yet | — |
| Ubuntu 24.04 LTS | expat | 2.6.1-2ubuntu0.5 | USN-8790-1 |
| Ubuntu 24.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 22.04 LTS | expat | 2.4.7-1ubuntu0.8 | USN-8790-1 |
| 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 | 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 +2 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | swish-e +2 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | expat | 2.2.9-1ubuntu0.8+esm2 | USN-8790-1 |
| Ubuntu Pro 20.04 LTS | swish-e +2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | coin3 +3 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | expat | 2.2.5-3ubuntu0.9+esm4 | USN-8790-1 |
| Ubuntu Pro 16.04 LTS | expat | 2.1.0-7ubuntu0.16.04.5+esm13 | USN-8790-1 |
| Ubuntu Pro 16.04 LTS | vtk +7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | expat | 2.1.0-4ubuntu1.4+esm12 | USN-8790-1 |
| Ubuntu Pro 14.04 LTS | vtk +3 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP7 | MozillaThunderbird | 153.5.0-150400.13.9.1 | SUSE-SU-2026:4736-1 |
| SLES 15 SP7 | expat | 2.7.1-150700.3.12.1 | SUSE-SU-2026:4619-1, SUSE-SU-2026:1352-1 |
| SLES 15 SP6 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP6 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLES 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP5 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLES 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP4 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLES 12 SP5 | MozillaFirefox | 153.5.0-118.16.2 | SUSE-SU-2026:4806-1 |
| SLES 12 SP5 | expat | 2.7.1-21.52.1 | SUSE-SU-2026:4615-1, SUSE-SU-2026:1159-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 |
| SLES for SAP 16.0 | expat | 2.7.1-160000.5.1 | SUSE-SU-2026:24469-1, SUSE-SU-2026:20985-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP6 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP5 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP4 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLES 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 |
| SLES 16.0 | expat | 2.7.1-160000.5.1 | SUSE-SU-2026:24469-1, SUSE-SU-2026:20985-1 |
| SLE Micro 6.2 | expat | 2.7.1-160000.5.1 | SUSE-SU-2026:24460-1, SUSE-SU-2026:20963-1 |
| SLE Micro 6.1 | expat | 2.7.1-slfo.1.1_5.1 | SUSE-SU-2026:24554-1, SUSE-SU-2026:21031-1 |
| SLE Micro 6.0 | expat | 2.7.1-5.1 | SUSE-SU-2026:24323-1, SUSE-SU-2026:21062-1 |
| SLE Micro 5.5 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLE Micro 5.4 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLE Micro 5.3 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLE Micro 5.2 | expat | 2.7.1-150000.3.45.1 | SUSE-SU-2026:1137-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLE HPC 15 SP5 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLE HPC 15 SP4 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:4623-1, SUSE-SU-2026:1166-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.7.5-1.1 | openSUSE-SU-2026:10466-1 |
| openSUSE Tumbleweed | mozjs115 | 115.15.0-8.1 | openSUSE-SU-2026:10620-1 |
| openSUSE Tumbleweed | mozjs140 | 140.10.0-1.1 | openSUSE-SU-2026:10642-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | openSUSE-SU-2026:22139-1 |
| openSUSE Leap 16.0 | expat | 2.7.1-160000.5.1 | openSUSE-SU-2026:22177-1, openSUSE-SU-2026:20448-1 |
| openSUSE Leap 15.6 | expat | 2.7.1-150400.3.37.1 | SUSE-SU-2026:1166-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.7.5-r0 | — |
| Alpine v3.23 | expat | 2.7.5-r0 | — |
| Alpine v3.22 | expat | 2.7.5-r0 | — |
| Alpine v3.21 | expat | 2.7.5-r0 | — |
| Alpine v3.20 | expat | 2.7.5-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.8.0-1.amzn2023.0.2 | ALAS2023-2026-1518 |
| Amazon Linux 2 | thunderbird | 140.8.0-1.amzn2.0.2 | ALAS2-2026-3219 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | expat | 2.6.4-5 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | expat | 2.7.5-r0 | — |
Advisories 35
- ICSA-26-155-04 Hitachi Energy RTU500 (Update A) CISA ICS & IT advisories · Nov 12, 2026
- 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
- SUSE-SU-2026:24554-1 Security update for expat SUSE / openSUSE Security Updates · Nov 7, 2026
- WID-SEC-2026-0733 libexpat: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 5, 2026
- SUSE-SU-2026:24469-1 Security update for expat SUSE / openSUSE Security Updates · Nov 4, 2026
- WID-SEC-2026-2189 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- SUSE-SU-2026:24460-1 Security update for expat SUSE / openSUSE Security Updates · Nov 2, 2026
- openSUSE-SU-2026:22177-1 Security update for expat SUSE / openSUSE Security Updates · Nov 1, 2026
- SUSE-SU-2026:24323-1 Security update for expat SUSE / openSUSE Security Updates · Oct 27, 2026
- SUSE-SU-2026:24260-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 23, 2026
- openSUSE-SU-2026:22139-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 22, 2026
- SUSE-SU-2026:4834-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 22, 2026
- SUSE-SU-2026:4806-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:4736-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Oct 20, 2026
- SUSE-SU-2026:4619-1 Security update for expat SUSE / openSUSE Security Updates · Oct 19, 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-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-2026-2912 Dell PowerScale OneFS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026
- USN-8790-1 expat vulnerabilities Ubuntu Security Notices (USN) · Sep 22, 2026
- WID-SEC-2026-2355 Dell integrated Dell Remote Access Controller: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 14, 2026
- openSUSE-SU-2026:10642-1 libmozjs-140-0-140.10.0-1.1 on GA media SUSE / openSUSE Security Updates · Apr 29, 2026
- openSUSE-SU-2026:10620-1 libmozjs-115-0-115.15.0-8.1 on GA media SUSE / openSUSE Security Updates · Apr 27, 2026
- SUSE-SU-2026:1352-1 Security update for expat SUSE / openSUSE Security Updates · Apr 16, 2026
- SUSE-SU-2026:21062-1 Security update for expat SUSE / openSUSE Security Updates · Apr 14, 2026
- SUSE-SU-2026:21031-1 Security update for expat SUSE / openSUSE Security Updates · Apr 14, 2026
- SUSE-SU-2026:20985-1 Security update for expat SUSE / openSUSE Security Updates · Apr 10, 2026
- SUSE-SU-2026:20963-1 Security update for expat SUSE / openSUSE Security Updates · Apr 9, 2026
- openSUSE-SU-2026:20448-1 Security update for expat SUSE / openSUSE Security Updates · Apr 3, 2026
- SUSE-SU-2026:1166-1 Security update for expat SUSE / openSUSE Security Updates · Apr 3, 2026
- ALAS2023-2026-1518 Moderate: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 1, 2026
- ALAS2-2026-3219 Moderate: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 1, 2026
- openSUSE-SU-2026:10466-1 expat-2.7.5-1.1 on GA media SUSE / openSUSE Security Updates · Apr 1, 2026
- SUSE-SU-2026:1159-1 Security update for expat SUSE / openSUSE Security Updates · Apr 1, 2026
- SUSE-SU-2026:1137-1 Security update for expat SUSE / openSUSE Security Updates · Mar 31, 2026