CVE-2026-56404
libexpat before 2.8.2 has an integer overflow in addBinding.
CVE-2026-56404 is fixed in 13 products on 1 platform, first by libxmltok1 1.2-4ubuntu0.18.04.1~esm7, released June 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
6.9
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0013
2nd percentile
libexpat before 2.8.2 has an integer overflow in addBinding.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| MozillaFirefox · opensuse-leap 16.0 | 153.5.0-160000.1.1 | OPENSUSE-SU-2026:22139-1 | Nov 7, 2026 |
| MozillaFirefox · sles 15.6 | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 | Nov 7, 2026 |
| MozillaFirefox · sles 15.7 | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 | Nov 7, 2026 |
| MozillaFirefox · sles 16.0 | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 | Nov 7, 2026 |
| MozillaThunderbird · sles 15.7 | 153.5.0-150400.13.9.1 | SUSE-SU-2026:4736-1 | Nov 7, 2026 |
| expat · Debian 12.15 (bookworm) | 2.5.0-1+deb12u3 | DEBIAN-CVE-2026-56404 | Jun 28, 2026 |
| expat · Debian 13.5 (trixie) | 2.8.2-1~deb13u1 | DEBIAN-CVE-2026-56404 | Jun 28, 2026 |
| expat · Debian 14 | 2.8.2-1 | DEBIAN-CVE-2026-56404 | Jun 28, 2026 |
| expat · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.9+esm4 | expat 2.2.5-3ubuntu0.9+esm4 | Jun 21, 2026 |
| expat · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.8+esm2 | expat 2.2.9-1ubuntu0.8+esm2 | Jun 21, 2026 |
| expat · Ubuntu 22.04.1 LTS (jammy) | 2.4.7-1ubuntu0.8 | expat 2.4.7-1ubuntu0.8 | Jun 21, 2026 |
| expat · Ubuntu 24.04.5 LTS (noble) | 2.6.1-2ubuntu0.5 | expat 2.6.1-2ubuntu0.5 | Jun 21, 2026 |
| expat · Ubuntu 26.04.1 LTS (resolute) | 2.7.4-1ubuntu0.1 | expat 2.7.4-1ubuntu0.1 | Jun 21, 2026 |
| expat · amzn 2023 | 2.8.3-1.amzn2023.0.1 | ALAS2023-2026-2157 | Sep 14, 2026 |
| expat · opensuse-leap 16.0 | 2.8.5-160000.1.1 | OPENSUSE-SU-2026:22177-1 | Nov 7, 2026 |
| expat · sles 15.6 | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 | Nov 7, 2026 |
| expat · sles 15.7 | 2.8.5-150700.3.15.1 | SUSE-SU-2026:4619-1 | Nov 7, 2026 |
| expat · sles 16.0 | 2.8.5-160000.1.1 | SUSE-SU-2026:24469-1 | Nov 7, 2026 |
| expat-debuginfo · amzn 2023 | 2.8.3-1.amzn2023.0.1 | ALAS2023-2026-2157 | Sep 14, 2026 |
| expat-debugsource · amzn 2023 | 2.8.3-1.amzn2023.0.1 | ALAS2023-2026-2157 | Sep 14, 2026 |
| expat-devel · amzn 2023 | 2.8.3-1.amzn2023.0.1 | ALAS2023-2026-2157 | Sep 14, 2026 |
| expat-static · amzn 2023 | 2.8.3-1.amzn2023.0.1 | ALAS2023-2026-2157 | Sep 14, 2026 |
| firefox · amzn 2023 | 140.12.0-1.amzn2023.0.1 | ALAS2023-2026-1928 | Jul 6, 2026 |
| firefox-debuginfo · amzn 2023 | 140.12.0-1.amzn2023.0.1 | ALAS2023-2026-1928 | Jul 6, 2026 |
| firefox-debugsource · amzn 2023 | 140.12.0-1.amzn2023.0.1 | ALAS2023-2026-1928 | Jul 6, 2026 |
| libexpat1 · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.9+esm4 | libexpat1 2.2.5-3ubuntu0.9+esm4 | Jun 21, 2026 |
| libexpat1 · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.8+esm2 | libexpat1 2.2.9-1ubuntu0.8+esm2 | Jun 21, 2026 |
| libexpat1 · Ubuntu 22.04.1 LTS (jammy) | 2.4.7-1ubuntu0.8 | libexpat1 2.4.7-1ubuntu0.8 | Jun 21, 2026 |
| libexpat1 · Ubuntu 24.04.5 LTS (noble) | 2.6.1-2ubuntu0.5 | libexpat1 2.6.1-2ubuntu0.5 | Jun 21, 2026 |
| libexpat1 · Ubuntu 26.04.1 LTS (resolute) | 2.7.4-1ubuntu0.1 | libexpat1 2.7.4-1ubuntu0.1 | Jun 21, 2026 |
| libxmltok1 · Ubuntu 18.04.6 LTS (bionic) | 1.2-4ubuntu0.18.04.1~esm7 | libxmltok1 1.2-4ubuntu0.18.04.1~esm7 | Jun 21, 2026 |
| libxmltok1 · Ubuntu 20.04 LTS (focal) | 1.2-4ubuntu0.20.04.1~esm7 | libxmltok1 1.2-4ubuntu0.20.04.1~esm7 | Jun 21, 2026 |
| libxmltok1 · Ubuntu 22.04.1 LTS (jammy) | 1.2-4ubuntu0.22.04.1~esm7 | libxmltok1 1.2-4ubuntu0.22.04.1~esm7 | Jun 21, 2026 |
| libxmltok1t64 · Ubuntu 24.04.5 LTS (noble) | 1.2-4.1ubuntu2.24.0.4.1+esm5 | libxmltok1t64 1.2-4.1ubuntu2.24.0.4.1+esm5 | Jun 21, 2026 |
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