# CVE-2026-102633: libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc CVE-2026-102633 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-102633, released October 10, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-102633 - Priority: High - CVSS: 8.2 (Moderate) - EPSS: 0.0037 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 29, 2026 - Weakness: Integer Overflow or Wraparound - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102633 ## Description libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | expat Debian 12.15 (bookworm) | 2.5.0-1+deb12u5 | [DEBIAN-CVE-2026-102633](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102633.md) | Oct 10, 2026 | | Linux | expat Debian 13.5 (trixie) | 2.9.0-1~deb13u1 | [DEBIAN-CVE-2026-102633](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102633.md) | Oct 10, 2026 | | Linux | expat Debian 14 | 2.8.5-2 | [DEBIAN-CVE-2026-102633](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102633.md) | Oct 10, 2026 | | Linux | expat RHEL 10 | 2.7.3-1.el10_2.7 | [RHSA-2026:88248](https://patchblox.com/security/data/fix/linux/rhsa-2026-88248.md) | Oct 24, 2026 | | Linux | expat RHEL 8 | 0:2.5.0-6.el8_10 | [RHSA-2026:92323](https://patchblox.com/security/data/fix/linux/rhsa-2026-92323.md) | Oct 30, 2026 | | Linux | expat RHEL 9 | 0:2.5.0-6.el9_8.7 | [RHSA-2026:88247](https://patchblox.com/security/data/fix/linux/rhsa-2026-88247.md) | Oct 24, 2026 | | Linux | expat almalinux 10 | 2.7.3-1.el10_2.7 | [ALSA-2026:88248](https://patchblox.com/security/data/fix/linux/alsa-2026-88248.md) | Nov 7, 2026 | | Linux | expat almalinux 8 | 2.5.0-6.el8_10 | [ALSA-2026:92323](https://patchblox.com/security/data/fix/linux/alsa-2026-92323.md) | Nov 7, 2026 | | Linux | expat almalinux 9 | 2.5.0-6.el9_8.7 | [ALSA-2026:88247](https://patchblox.com/security/data/fix/linux/alsa-2026-88247.md) | Nov 7, 2026 | | Linux | expat ol 10 | 0:2.7.3-1.el10_2.7 | [ELSA-2026-88248](https://patchblox.com/security/data/fix/linux/elsa-2026-88248.md) | Nov 7, 2026 | | Linux | expat ol 8 | 0:2.5.0-6.el8_10 | [ELSA-2026-92323](https://patchblox.com/security/data/fix/linux/elsa-2026-92323.md) | Nov 7, 2026 | | Linux | expat ol 9 | 0:2.5.0-6.el9_8.7 | [ELSA-2026-88247](https://patchblox.com/security/data/fix/linux/elsa-2026-88247.md) | Nov 7, 2026 | | Linux | expat opensuse-leap 16.0 | 2.8.5-160000.1.1 | [OPENSUSE-SU-2026:22177-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22177-1.md) | Nov 7, 2026 | | Linux | expat rocky 10 | 0:2.7.3-1.el10_2.7 | [RLSA-2026:88248](https://patchblox.com/security/data/fix/linux/rlsa-2026-88248.md) | Nov 7, 2026 | | Linux | expat rocky 8 | 0:2.5.0-6.el8_10 | [RLSA-2026:92323](https://patchblox.com/security/data/fix/linux/rlsa-2026-92323.md) | Nov 7, 2026 | | Linux | expat rocky 9 | 0:2.5.0-6.el9_8.7 | [RLSA-2026:88247](https://patchblox.com/security/data/fix/linux/rlsa-2026-88247.md) | Nov 7, 2026 | | Linux | expat sles 15.6 | 2.8.5-150400.3.40.1 | [SUSE-SU-2026:4623-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4623-1.md) | Nov 7, 2026 | | Linux | expat sles 15.7 | 2.8.5-150700.3.15.1 | [SUSE-SU-2026:4619-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4619-1.md) | Nov 7, 2026 | | Linux | expat sles 16.0 | 2.8.5-160000.1.1 | [SUSE-SU-2026:24469-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24469-1.md) | Nov 7, 2026 | | Linux | expat-devel RHEL 8 | 0:2.5.0-6.el8_10 | [RHSA-2026:92323](https://patchblox.com/security/data/fix/linux/rhsa-2026-92323.md) | Oct 30, 2026 | | Linux | expat-devel RHEL 9 | 0:2.5.0-6.el9_8.7 | [RHSA-2026:88247](https://patchblox.com/security/data/fix/linux/rhsa-2026-88247.md) | Oct 24, 2026 | | Linux | expat-devel almalinux 8 | 2.5.0-6.el8_10 | [ALSA-2026:92323](https://patchblox.com/security/data/fix/linux/alsa-2026-92323.md) | Nov 7, 2026 | | Linux | expat-devel almalinux 9 | 2.5.0-6.el9_8.7 | [ALSA-2026:88247](https://patchblox.com/security/data/fix/linux/alsa-2026-88247.md) | Nov 7, 2026 | | Linux | expat-devel ol 10 | 0:2.7.3-1.el10_2.7 | [ELSA-2026-88248](https://patchblox.com/security/data/fix/linux/elsa-2026-88248.md) | Nov 7, 2026 | | Linux | expat-devel ol 8 | 0:2.5.0-6.el8_10 | [ELSA-2026-92323](https://patchblox.com/security/data/fix/linux/elsa-2026-92323.md) | Nov 7, 2026 | | Linux | expat-devel ol 9 | 0:2.5.0-6.el9_8.7 | [ELSA-2026-88247](https://patchblox.com/security/data/fix/linux/elsa-2026-88247.md) | Nov 7, 2026 | | Linux | firefox amzn 2023 | 140.17.0-1.amzn2023.0.1 | [ALAS2023-2026-3214](https://patchblox.com/security/data/fix/linux/alas2023-2026-3214.md) | Nov 7, 2026 | | Linux | firefox-debuginfo amzn 2023 | 140.17.0-1.amzn2023.0.1 | [ALAS2023-2026-3214](https://patchblox.com/security/data/fix/linux/alas2023-2026-3214.md) | Nov 7, 2026 | | Linux | firefox-debugsource amzn 2023 | 140.17.0-1.amzn2023.0.1 | [ALAS2023-2026-3214](https://patchblox.com/security/data/fix/linux/alas2023-2026-3214.md) | Nov 7, 2026 | --- Data as of 2026-11-09T13:31:49Z UTC. 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