CVE-2026-56407
libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.
CVE-2026-56407 is fixed in 11 products on 1 platform, first by DEBIAN-CVE-2026-56407, released June 28, 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
0.0017
6th percentile
libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.
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-2026-56407 | Jun 28, 2026 |
| expat · Debian 13.5 (trixie) | 2.8.2-1~deb13u1 | DEBIAN-CVE-2026-56407 | Jun 28, 2026 |
| expat · Debian 14 | 2.8.2-1 | DEBIAN-CVE-2026-56407 | 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 | 2.6.3-1.amzn2023.0.6 | ALAS2023-2026-1913 | Jul 6, 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 | 2.6.3-1.amzn2023.0.6 | ALAS2023-2026-1913 | Jul 6, 2026 |
| expat-debugsource · amzn 2023 | 2.6.3-1.amzn2023.0.6 | ALAS2023-2026-1913 | Jul 6, 2026 |
| expat-devel · amzn 2023 | 2.6.3-1.amzn2023.0.6 | ALAS2023-2026-1913 | Jul 6, 2026 |
| expat-static · amzn 2023 | 2.6.3-1.amzn2023.0.6 | ALAS2023-2026-1913 | Jul 6, 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+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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