Expat through 2.8.4 Malformed UTF-16 Acceptance via Unchecked Surrogate
CVE-2026-93990 is fixed in 7 products on 1 platform, first by DEBIAN-CVE-2026-93990, released September 26, 2026. It is not reported as exploited. Patch Radar priority: High.
Expat is a C library for parsing XML documents. Security Fix(es): * expat: Expat: Denial of Service via quadratic complexity in attribute processing (CVE-2026-66046) * expat: Expat: XML Injection via Malformed UTF-16 Input (CVE-2026-93990) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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+deb12u4 | DEBIAN-CVE-2026-93990 | Sep 26, 2026 |
| expat · Debian 13.5 (trixie) | 2.9.0-1~deb13u1 | DEBIAN-CVE-2026-93990 | Sep 26, 2026 |
| expat · Debian 14 | 2.8.4-2 | DEBIAN-CVE-2026-93990 | Sep 26, 2026 |
| expat · RHEL 10 | 2.7.3-1.el10_2.5 | RHSA-2026:74001 | Oct 1, 2026 |
| expat · RHEL 8 | 0:2.5.0-4.el8_10 | RHSA-2026:72448 | Sep 29, 2026 |
| expat · RHEL 9 | 0:2.5.0-6.el9_8.5 | RHSA-2026:72663 | Sep 29, 2026 |
| expat · almalinux 10 | 2.7.3-1.el10_2.5 | ALSA-2026:74001 | Sep 30, 2026 |
| expat · almalinux 8 | 2.5.0-4.el8_10 | ALSA-2026:72448 | Sep 28, 2026 |
| expat · almalinux 9 | 2.5.0-6.el9_8.5 | ALSA-2026:72663 | Sep 28, 2026 |
| expat · ol 10 | 0:2.7.3-1.el10_2.5 | ELSA-2026-74001 | Oct 1, 2026 |
| expat · ol 8 | 0:2.5.0-4.el8_10 | ELSA-2026-72448 | Sep 29, 2026 |
| expat · ol 9 | 0:2.5.0-6.el9_8.5 | ELSA-2026-72663 | Sep 28, 2026 |
| expat · opensuse-leap 16.0 | 2.8.5-160000.1.1 | OPENSUSE-SU-2026:22177-1 | Nov 7, 2026 |
| expat · rocky 10 | 0:2.7.3-1.el10_2.5 | RLSA-2026:74001 | Oct 1, 2026 |
| expat · rocky 8 | 0:2.5.0-4.el8_10 | RLSA-2026:72448 | Sep 29, 2026 |
| expat · rocky 9 | 0:2.5.0-6.el9_8.5 | RLSA-2026:72663 | Sep 30, 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-devel · RHEL 8 | 0:2.5.0-4.el8_10 | RHSA-2026:72448 | Sep 29, 2026 |
| expat-devel · RHEL 9 | 0:2.5.0-6.el9_8.5 | RHSA-2026:72663 | Sep 29, 2026 |
| expat-devel · almalinux 10 | 2.7.3-1.el10_2.5 | ALSA-2026:74001 | Sep 30, 2026 |
| expat-devel · almalinux 8 | 2.5.0-4.el8_10 | ALSA-2026:72448 | Sep 28, 2026 |
| expat-devel · almalinux 9 | 2.5.0-6.el9_8.5 | ALSA-2026:72663 | Sep 28, 2026 |
| expat-devel · ol 10 | 0:2.7.3-1.el10_2.5 | ELSA-2026-74001 | Oct 1, 2026 |
| expat-devel · ol 8 | 0:2.5.0-4.el8_10 | ELSA-2026-72448 | Sep 29, 2026 |
| expat-devel · ol 9 | 0:2.5.0-6.el9_8.5 | ELSA-2026-72663 | Sep 28, 2026 |
| firefox · amzn 2023 | 140.17.0-1.amzn2023.0.1 | ALAS2023-2026-3214 | Nov 7, 2026 |
| firefox-debuginfo · amzn 2023 | 140.17.0-1.amzn2023.0.1 | ALAS2023-2026-3214 | Nov 7, 2026 |
| firefox-debugsource · amzn 2023 | 140.17.0-1.amzn2023.0.1 | ALAS2023-2026-3214 | Nov 7, 2026 |
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