# CVE-2021-46143: expat: In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integeroverflow exists for m_groupSize.

CVE-2021-46143 is fixed in 19 products on 1 platform, first by libxmltok1t64 1.2-4.1ubuntu3.1, released September 4, 2019. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-46143
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.0447
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 5, 2022

## Description

In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integeroverflow exists for m_groupSize.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | expat Debian 12.15 (bookworm) | 2.4.3-1 | [DEBIAN-CVE-2021-46143](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46143.md) | Jan 6, 2022 |
| Linux | expat Debian 13.5 (trixie) | 2.4.3-1 | [DEBIAN-CVE-2021-46143](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46143.md) | Jan 6, 2022 |
| Linux | expat Debian 14 | 2.4.3-1 | [DEBIAN-CVE-2021-46143](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46143.md) | Jan 6, 2022 |
| Linux | expat RHEL 8 | 0:2.2.5-4.el8_5.3 | [RHSA-2022:0951](https://patchblox.com/security/data/fix/linux/rhsa-2022-0951.md) | Mar 16, 2022 |
| Linux | expat RHEL 9 | 0:2.2.10-12.el9_0 | [RHBA-2022:4046](https://patchblox.com/security/data/fix/linux/rhba-2022-4046.md) | May 17, 2022 |
| Linux | expat Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.4 | [expat 2.2.5-3ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-expat-2.2.5-3ubuntu0.4.md) | Feb 14, 2022 |
| Linux | expat Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.2 | [expat 2.2.9-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-expat-2.2.9-1ubuntu0.2.md) | Feb 14, 2022 |
| Linux | expat Ubuntu 22.04.1 LTS (jammy) | 2.4.3-1 | [expat 2.4.3-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-expat-2.4.3-1.md) | Jan 10, 2022 |
| Linux | expat Ubuntu 24.10 (oracular) | 2.4.3-1 | [expat 2.4.3-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-expat-2.4.3-1.md) | Jan 16, 2026 |
| Linux | expat Ubuntu 25.04 (plucky) | 2.4.3-1 | [expat 2.4.3-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-expat-2.4.3-1.md) | Jan 16, 2026 |
| Linux | expat almalinux 8 | 2.2.5-8.el8_6.2 | [ALSA-2022:0951](https://patchblox.com/security/data/fix/linux/alsa-2022-0951.md) | Mar 16, 2022 |
| Linux | expat amzn 2023 | 2.5.0-1.amzn2023.0.2 | [ALAS2023-2023-058](https://patchblox.com/security/data/fix/linux/alas2023-2023-058.md) | Feb 17, 2023 |
| Linux | expat ol 8 | 0:2.2.5-4.el8_5.3 | [ELSA-2022-0951](https://patchblox.com/security/data/fix/linux/elsa-2022-0951.md) | Mar 16, 2022 |
| Linux | expat rocky 8 | 0:2.2.5-4.el8_5.3 | [RLSA-2022:0951](https://patchblox.com/security/data/fix/linux/rlsa-2022-0951.md) | Mar 16, 2022 |
| Linux | expat-debuginfo amzn 2023 | 2.5.0-1.amzn2023.0.2 | [ALAS2023-2023-058](https://patchblox.com/security/data/fix/linux/alas2023-2023-058.md) | Feb 17, 2023 |
| Linux | expat-debugsource amzn 2023 | 2.5.0-1.amzn2023.0.2 | [ALAS2023-2023-058](https://patchblox.com/security/data/fix/linux/alas2023-2023-058.md) | Feb 17, 2023 |
| Linux | expat-devel RHEL 8 | 0:2.2.5-4.el8_5.3 | [RHSA-2022:0951](https://patchblox.com/security/data/fix/linux/rhsa-2022-0951.md) | Mar 16, 2022 |
| Linux | expat-devel RHEL 9 | 0:2.2.10-12.el9_0 | [RHBA-2022:4046](https://patchblox.com/security/data/fix/linux/rhba-2022-4046.md) | May 17, 2022 |
| Linux | expat-devel almalinux 8 | 2.2.5-8.el8_6.2 | [ALSA-2022:0951](https://patchblox.com/security/data/fix/linux/alsa-2022-0951.md) | Mar 16, 2022 |
| Linux | expat-devel amzn 2023 | 2.5.0-1.amzn2023.0.2 | [ALAS2023-2023-058](https://patchblox.com/security/data/fix/linux/alas2023-2023-058.md) | Feb 17, 2023 |
| Linux | expat-devel ol 8 | 0:2.2.5-4.el8_5.3 | [ELSA-2022-0951](https://patchblox.com/security/data/fix/linux/elsa-2022-0951.md) | Mar 16, 2022 |
| Linux | expat-static amzn 2023 | 2.5.0-1.amzn2023.0.2 | [ALAS2023-2023-058](https://patchblox.com/security/data/fix/linux/alas2023-2023-058.md) | Feb 17, 2023 |
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 98.0+build3-0ubuntu0.18.04.2 | [firefox 98.0+build3-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-98.0-build3-0ubuntu0.18.04.2.md) | Mar 8, 2022 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 98.0+build3-0ubuntu0.20.04.2 | [firefox 98.0+build3-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-98.0-build3-0ubuntu0.20.04.2.md) | Mar 8, 2022 |
| Linux | firefox Ubuntu 22.04.1 LTS (jammy) | 1:1snap1-0ubuntu1 | [firefox 1:1snap1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-firefox-1-1snap1-0ubuntu1.md) | Apr 6, 2022 |
| Linux | firefox Ubuntu 24.10 (oracular) | 1:1snap1-0ubuntu1 | [firefox 1:1snap1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-firefox-1-1snap1-0ubuntu1.md) | Feb 15, 2022 |
| Linux | firefox Ubuntu 25.04 (plucky) | 1:1snap1-0ubuntu1 | [firefox 1:1snap1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-firefox-1-1snap1-0ubuntu1.md) | Feb 15, 2022 |
| Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 98.0+build3-0ubuntu0.18.04.2 | [firefox-geckodriver 98.0+build3-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-98.0-build3-0ubuntu0.18.04.2.md) | Mar 8, 2022 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 98.0+build3-0ubuntu0.20.04.2 | [firefox-geckodriver 98.0+build3-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-98.0-build3-0ubuntu0.20.04.2.md) | Mar 8, 2022 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 98.0+build3-0ubuntu0.18.04.2 | [firefox-mozsymbols 98.0+build3-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-98.0-build3-0ubuntu0.18.04.2.md) | Mar 8, 2022 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 98.0+build3-0ubuntu0.20.04.2 | [firefox-mozsymbols 98.0+build3-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-98.0-build3-0ubuntu0.20.04.2.md) | Mar 8, 2022 |
| Linux | libexpat1 Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.4 | [libexpat1 2.2.5-3ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libexpat1-2.2.5-3ubuntu0.4.md) | Feb 14, 2022 |
| Linux | libexpat1 Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.2 | [libexpat1 2.2.9-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libexpat1-2.2.9-1ubuntu0.2.md) | Feb 14, 2022 |
| Linux | libexpat1 Ubuntu 22.04.1 LTS (jammy) | 2.4.3-1 | [libexpat1 2.4.3-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libexpat1-2.4.3-1.md) | Jan 10, 2022 |
| Linux | libexpat1 Ubuntu 24.10 (oracular) | 2.4.3-1 | [libexpat1 2.4.3-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libexpat1-2.4.3-1.md) | Jan 16, 2026 |
| Linux | libexpat1 Ubuntu 25.04 (plucky) | 2.4.3-1 | [libexpat1 2.4.3-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libexpat1-2.4.3-1.md) | Jan 16, 2026 |
| Linux | libxmltok1 Ubuntu 18.04.6 LTS (bionic) | 1.2-4ubuntu0.18.04.1~esm4 | [libxmltok1 1.2-4ubuntu0.18.04.1~esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxmltok1-1.2-4ubuntu0.18.04.1-esm4.md) | Jan 10, 2022 |
| Linux | libxmltok1 Ubuntu 20.04 LTS (focal) | 1.2-4ubuntu0.20.04.1~esm4 | [libxmltok1 1.2-4ubuntu0.20.04.1~esm4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libxmltok1-1.2-4ubuntu0.20.04.1-esm4.md) | Jan 10, 2022 |
| Linux | libxmltok1 Ubuntu 22.04.1 LTS (jammy) | 1.2-4ubuntu0.22.04.1~esm4 | [libxmltok1 1.2-4ubuntu0.22.04.1~esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxmltok1-1.2-4ubuntu0.22.04.1-esm4.md) | Jan 10, 2022 |
| Linux | libxmltok1t64 Ubuntu 24.04.5 LTS (noble) | 1.2-4.1ubuntu2.24.0.4.1+esm2 | [libxmltok1t64 1.2-4.1ubuntu2.24.0.4.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxmltok1t64-1.2-4.1ubuntu2.24.0.4.1-esm2.md) | Jan 10, 2022 |
| Linux | libxmltok1t64 Ubuntu 24.10 (oracular) | 1.2-4.1ubuntu3.1 | [libxmltok1t64 1.2-4.1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libxmltok1t64-1.2-4.1ubuntu3.1.md) | Sep 4, 2019 |
| Linux | mame Ubuntu 18.04.6 LTS (bionic) | 0.195+dfsg.1-2ubuntu0.1~esm1 | [mame 0.195+dfsg.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mame-0.195-dfsg.1-2ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame Ubuntu 20.04 LTS (focal) | 0.220+dfsg.1-1ubuntu0.1~esm1 | [mame 0.220+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mame-0.220-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame Ubuntu 22.04.1 LTS (jammy) | 0.242+dfsg.1-1ubuntu0.1~esm1 | [mame 0.242+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mame-0.242-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame Ubuntu 24.04.5 LTS (noble) | 0.264+dfsg.1-1ubuntu0.1~esm1 | [mame 0.264+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mame-0.264-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame Ubuntu 25.10 (questing) | 0.277+dfsg.1-4ubuntu0.1 | [mame 0.277+dfsg.1-4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mame-0.277-dfsg.1-4ubuntu0.1.md) | Jun 23, 2022 |
| Linux | mame Ubuntu 26.04.1 LTS (resolute) | 0.281+dfsg1-1build1 | [mame 0.281+dfsg1-1build1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mame-0.281-dfsg1-1build1.md) | Jan 5, 2022 |
| Linux | mame-data Ubuntu 18.04.6 LTS (bionic) | 0.195+dfsg.1-2ubuntu0.1~esm1 | [mame-data 0.195+dfsg.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mame-data-0.195-dfsg.1-2ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-data Ubuntu 20.04 LTS (focal) | 0.220+dfsg.1-1ubuntu0.1~esm1 | [mame-data 0.220+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mame-data-0.220-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-data Ubuntu 22.04.1 LTS (jammy) | 0.242+dfsg.1-1ubuntu0.1~esm1 | [mame-data 0.242+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mame-data-0.242-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-data Ubuntu 24.04.5 LTS (noble) | 0.264+dfsg.1-1ubuntu0.1~esm1 | [mame-data 0.264+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mame-data-0.264-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-data Ubuntu 25.10 (questing) | 0.277+dfsg.1-4ubuntu0.1 | [mame-data 0.277+dfsg.1-4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mame-data-0.277-dfsg.1-4ubuntu0.1.md) | Jun 23, 2022 |
| Linux | mame-data Ubuntu 26.04.1 LTS (resolute) | 0.281+dfsg1-1build1 | [mame-data 0.281+dfsg1-1build1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mame-data-0.281-dfsg1-1build1.md) | Jan 5, 2022 |
| Linux | mame-tools Ubuntu 18.04.6 LTS (bionic) | 0.195+dfsg.1-2ubuntu0.1~esm1 | [mame-tools 0.195+dfsg.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mame-tools-0.195-dfsg.1-2ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-tools Ubuntu 20.04 LTS (focal) | 0.220+dfsg.1-1ubuntu0.1~esm1 | [mame-tools 0.220+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mame-tools-0.220-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-tools Ubuntu 22.04.1 LTS (jammy) | 0.242+dfsg.1-1ubuntu0.1~esm1 | [mame-tools 0.242+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mame-tools-0.242-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-tools Ubuntu 24.04.5 LTS (noble) | 0.264+dfsg.1-1ubuntu0.1~esm1 | [mame-tools 0.264+dfsg.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mame-tools-0.264-dfsg.1-1ubuntu0.1-esm1.md) | Jun 23, 2022 |
| Linux | mame-tools Ubuntu 25.10 (questing) | 0.277+dfsg.1-4ubuntu0.1 | [mame-tools 0.277+dfsg.1-4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mame-tools-0.277-dfsg.1-4ubuntu0.1.md) | Jun 23, 2022 |
| Linux | mame-tools Ubuntu 26.04.1 LTS (resolute) | 0.281+dfsg1-1build1 | [mame-tools 0.281+dfsg1-1build1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mame-tools-0.281-dfsg1-1build1.md) | Jan 5, 2022 |
| Linux | xmlrpc-c RHEL 8 | 0:1.51.0-8.el8 | [RHSA-2022:7692](https://patchblox.com/security/data/fix/linux/rhsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c almalinux 8 | 1.51.0-8.el8 | [ALSA-2022:7692](https://patchblox.com/security/data/fix/linux/alsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c ol 8 | 0:1.51.0-8.el8 | [ELSA-2022-7692](https://patchblox.com/security/data/fix/linux/elsa-2022-7692.md) | Nov 15, 2022 |
| Linux | xmlrpc-c rocky 8 | 0:1.51.0-8.el8 | [RLSA-2022:7692](https://patchblox.com/security/data/fix/linux/rlsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-c++ RHEL 8 | 0:1.51.0-8.el8 | [RHSA-2022:7692](https://patchblox.com/security/data/fix/linux/rhsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-c++ almalinux 8 | 1.51.0-8.el8 | [ALSA-2022:7692](https://patchblox.com/security/data/fix/linux/alsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-c++ ol 8 | 0:1.51.0-8.el8 | [ELSA-2022-7692](https://patchblox.com/security/data/fix/linux/elsa-2022-7692.md) | Nov 15, 2022 |
| Linux | xmlrpc-c-client RHEL 8 | 0:1.51.0-8.el8 | [RHSA-2022:7692](https://patchblox.com/security/data/fix/linux/rhsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-client almalinux 8 | 1.51.0-8.el8 | [ALSA-2022:7692](https://patchblox.com/security/data/fix/linux/alsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-client ol 8 | 0:1.51.0-8.el8 | [ELSA-2022-7692](https://patchblox.com/security/data/fix/linux/elsa-2022-7692.md) | Nov 15, 2022 |
| Linux | xmlrpc-c-client++ RHEL 8 | 0:1.51.0-8.el8 | [RHSA-2022:7692](https://patchblox.com/security/data/fix/linux/rhsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-client++ almalinux 8 | 1.51.0-8.el8 | [ALSA-2022:7692](https://patchblox.com/security/data/fix/linux/alsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-client++ ol 8 | 0:1.51.0-8.el8 | [ELSA-2022-7692](https://patchblox.com/security/data/fix/linux/elsa-2022-7692.md) | Nov 15, 2022 |
| Linux | xmlrpc-c-devel RHEL 8 | 0:1.51.0-8.el8 | [RHSA-2022:7692](https://patchblox.com/security/data/fix/linux/rhsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-devel almalinux 8 | 1.51.0-8.el8 | [ALSA-2022:7692](https://patchblox.com/security/data/fix/linux/alsa-2022-7692.md) | Nov 8, 2022 |
| Linux | xmlrpc-c-devel ol 8 | 0:1.51.0-8.el8 | [ELSA-2022-7692](https://patchblox.com/security/data/fix/linux/elsa-2022-7692.md) | Nov 15, 2022 |

---

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