CVE-2026-56132
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
CVE-2026-56132 is fixed in 11 products on 1 platform, first by RHSA-2026:64810, released June 19, 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
0.0014
3rd percentile
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
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+deb12u5 | DEBIAN-CVE-2026-56132 | Jun 28, 2026 |
| expat · Debian 13.5 (trixie) | 2.8.2-1~deb13u1 | DEBIAN-CVE-2026-56132 | Jun 28, 2026 |
| expat · Debian 14 | 2.8.2-1 | DEBIAN-CVE-2026-56132 | Jun 28, 2026 |
| expat · RHEL 10 | 2.7.3-1.el10_2.3 | RHSA-2026:64810 | Jun 19, 2026 |
| expat · RHEL 8 | 0:2.5.0-2.el8_10.2 | RHSA-2026:64809 | Sep 13, 2026 |
| expat · RHEL 9 | 0:2.5.0-6.el9_8.3 | RHSA-2026:64812 | Sep 13, 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 · almalinux 10 | 2.7.3-1.el10_2.3 | ALSA-2026:64810 | Sep 8, 2026 |
| expat · almalinux 8 | 2.5.0-2.el8_10.2 | ALSA-2026:64809 | Sep 8, 2026 |
| expat · almalinux 9 | 2.5.0-6.el9_8.3 | ALSA-2026:64812 | Sep 8, 2026 |
| expat · amzn 2023 | 2.6.3-1.amzn2023.0.5 | ALAS2023-2026-1900 | Jul 6, 2026 |
| expat · ol 10 | 0:2.7.3-1.el10_2.3 | ELSA-2026-64810-0 | Sep 8, 2026 |
| expat · ol 8 | 0:2.5.0-2.el8_10.2 | ELSA-2026-64809-0 | Sep 8, 2026 |
| expat · ol 9 | 0:2.5.0-6.el9_8.3 | ELSA-2026-64812-0 | Sep 8, 2026 |
| expat · opensuse-leap 16.0 | 2.8.4-160000.1.1 | OPENSUSE-SU-2026:21945-1 | Sep 24, 2026 |
| expat · rocky 10 | 0:2.7.3-1.el10_2.3 | RLSA-2026:64810 | Sep 9, 2026 |
| expat · rocky 8 | 0:2.5.0-2.el8_10.2 | RLSA-2026:64809 | Sep 9, 2026 |
| expat · rocky 9 | 0:2.5.0-6.el9_8.3 | RLSA-2026:64812 | Sep 9, 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.amzn2023.0.5 | ALAS2023-2026-1900 | Jul 6, 2026 |
| expat-debugsource · amzn 2023 | 2.6.3-1.amzn2023.0.5 | ALAS2023-2026-1900 | Jul 6, 2026 |
| expat-devel · RHEL 8 | 0:2.5.0-2.el8_10.2 | RHSA-2026:64809 | Sep 13, 2026 |
| expat-devel · RHEL 9 | 0:2.5.0-6.el9_8.3 | RHSA-2026:64812 | Sep 13, 2026 |
| expat-devel · almalinux 10 | 2.7.3-1.el10_2.3 | ALSA-2026:64810 | Sep 8, 2026 |
| expat-devel · almalinux 8 | 2.5.0-2.el8_10.2 | ALSA-2026:64809 | Sep 8, 2026 |
| expat-devel · almalinux 9 | 2.5.0-6.el9_8.3 | ALSA-2026:64812 | Sep 8, 2026 |
| expat-devel · amzn 2023 | 2.6.3-1.amzn2023.0.5 | ALAS2023-2026-1900 | Jul 6, 2026 |
| expat-devel · ol 10 | 0:2.7.3-1.el10_2.3 | ELSA-2026-64810-0 | Sep 8, 2026 |
| expat-devel · ol 8 | 0:2.5.0-2.el8_10.2 | ELSA-2026-64809-0 | Sep 8, 2026 |
| expat-devel · ol 9 | 0:2.5.0-6.el9_8.3 | ELSA-2026-64812-0 | Sep 8, 2026 |
| expat-static · amzn 2023 | 2.6.3-1.amzn2023.0.5 | ALAS2023-2026-1900 | 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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