Description
In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| libexpat project | libexpat | 2.8.2 – < 2.8.4 | 2.8.4 |
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 | 2.8.4-1 | — |
| Debian 13 | expat | 2.9.0-1~deb13u1 | — |
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 24.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 22.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 20.04 LTS | tdom +4 | No fix yet | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | swish-e +2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | coin3 +3 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | vtk +7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | vtk +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | expat +2 | 2.8.3-0.1.1.hum1 | RHSA-2026:65568, RHSA-2026:60451 |
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 | 2.8.5-150700.3.15.1 | SUSE-SU-2026:4619-1 |
| SLES 15 SP6 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP6 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 12 SP5 | MozillaFirefox | 153.5.0-118.16.2 | SUSE-SU-2026:4806-1 |
| SLES 12 SP5 | expat | 2.8.5-21.55.1 | SUSE-SU-2026:4615-1 |
Show 13 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 | 2.8.4-160000.1.1 | SUSE-SU-2026:23912-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP6 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 |
| SLES 16.0 | expat | 2.8.4-160000.1.1 | SUSE-SU-2026:23912-1 |
| SLE Micro 6.2 | expat | 2.8.4-160000.1.1 | SUSE-SU-2026:23894-1 |
| SLE Micro 6.1 | expat | 2.8.5-slfo.1.1_1.1 | SUSE-SU-2026:24554-1 |
| 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 | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLE HPC 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLE HPC 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.8.4-1.1 | openSUSE-SU-2026:11733-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | openSUSE-SU-2026:22139-1 |
| openSUSE Leap 16.0 | expat | 2.8.4-160000.1.1 | openSUSE-SU-2026:21945-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.8.4-r0 | — |
| Alpine v3.23 | expat | 2.8.4-r0 | — |
| Alpine v3.22 | expat | 2.8.4-r0 | — |
| Alpine v3.21 | expat | 2.8.4-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | expat | 2.8.3-2 | — |
Advisories 18
- SUSE-SU-2026:24554-1 Security update for expat SUSE / openSUSE Security Updates · Nov 7, 2026
- WID-SEC-2026-2944 expat: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 5, 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
- RHSA-2026:65568 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2026-3642 Meinberg LANTIME: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 14, 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
- RHSA-2026:60451 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- SUSE-SU-2026:23912-1 Security update for expat SUSE / openSUSE Security Updates · Sep 30, 2026
- SUSE-SU-2026:23894-1 Security update for expat SUSE / openSUSE Security Updates · Sep 30, 2026
- openSUSE-SU-2026:21945-1 Security update for expat SUSE / openSUSE Security Updates · Sep 25, 2026
- openSUSE-SU-2026:11733-1 expat-2.8.4-1.1 on GA media SUSE / openSUSE Security Updates · Sep 10, 2026