CVE-2026-56409
xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.
CVE-2026-56409 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-56409, released June 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
6.5
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0012
1st percentile
xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.
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-2026-56409 | Jun 28, 2026 |
| expat · Debian 13.5 (trixie) | 2.8.2-1~deb13u1 | DEBIAN-CVE-2026-56409 | Jun 28, 2026 |
| expat · Debian 14 | 2.8.2-1 | DEBIAN-CVE-2026-56409 | Jun 28, 2026 |
| expat · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.9+esm5 | expat 2.2.5-3ubuntu0.9+esm5 | Aug 20, 2026 |
| expat · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.8+esm3 | expat 2.2.9-1ubuntu0.8+esm3 | Aug 20, 2026 |
| expat · Ubuntu 22.04.1 LTS (jammy) | 2.4.7-1ubuntu0.9 | expat 2.4.7-1ubuntu0.9 | Aug 20, 2026 |
| expat · Ubuntu 24.04.5 LTS (noble) | 2.6.1-2ubuntu0.6 | expat 2.6.1-2ubuntu0.6 | Aug 20, 2026 |
| expat · Ubuntu 26.04.1 LTS (resolute) | 2.7.4-1ubuntu0.2 | expat 2.7.4-1ubuntu0.2 | Aug 20, 2026 |
| expat · amzn 2023 | 2.8.3-1.amzn2023.0.1 | ALAS2023-2026-2157 | Sep 14, 2026 |
| expat · opensuse-leap 16.0 | 2.8.4-160000.1.1 | OPENSUSE-SU-2026:21945-1 | Sep 24, 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 | 2.8.4-160000.1.1 | SUSE-SU-2026:23912-1 | Sep 24, 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 |
| libexpat1 · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.9+esm5 | libexpat1 2.2.5-3ubuntu0.9+esm5 | Aug 20, 2026 |
| libexpat1 · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.8+esm3 | libexpat1 2.2.9-1ubuntu0.8+esm3 | Aug 20, 2026 |
| libexpat1 · Ubuntu 22.04.1 LTS (jammy) | 2.4.7-1ubuntu0.9 | libexpat1 2.4.7-1ubuntu0.9 | Aug 20, 2026 |
| libexpat1 · Ubuntu 24.04.5 LTS (noble) | 2.6.1-2ubuntu0.6 | libexpat1 2.6.1-2ubuntu0.6 | Aug 20, 2026 |
| libexpat1 · Ubuntu 26.04.1 LTS (resolute) | 2.7.4-1ubuntu0.2 | libexpat1 2.7.4-1ubuntu0.2 | Aug 20, 2026 |
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