# CVE-2019-15903: Python 3.6 and 2 others: Out-of-bounds Read

CVE-2019-15903 is fixed in 20 products on 2 platforms, first by chromium-browser 78.0.3904.70-0ubuntu1, released September 3, 2019. 2 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2019-15903
- Priority: High
- CVSS: 7.5 (Medium)
- EPSS: 0.0664
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 3, 2019
- Weakness: CWE-125: Out-of-bounds Read
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-15903

## Description

In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber) then resulted in a heap-based buffer over-read.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Python 3.7 | 3.7.5 | [Python 3.7 3.7.5](https://patchblox.com/security/data/fix/windows-app/python.python.3.7-3.7.5.md) | Oct 14, 2019 |
| Linux | chromium-browser Ubuntu 18.04.6 LTS (bionic) | 78.0.3904.70-0ubuntu0.18.04.2 | [chromium-browser 78.0.3904.70-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-78.0.3904.70-0ubuntu0.18.04.2.md) | Nov 25, 2019 |
| Linux | chromium-browser Ubuntu 20.04 LTS (focal) | 78.0.3904.70-0ubuntu1 | [chromium-browser 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-chromium-browser-78.0.3904.70-0ubuntu1.md) | Sep 3, 2019 |
| Linux | chromium-browser Ubuntu 24.10 (oracular) | 78.0.3904.70-0ubuntu1 | [chromium-browser 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-chromium-browser-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-browser Ubuntu 25.04 (plucky) | 78.0.3904.70-0ubuntu1 | [chromium-browser 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-chromium-browser-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-browser-l10n Ubuntu 18.04.6 LTS (bionic) | 78.0.3904.70-0ubuntu0.18.04.2 | [chromium-browser-l10n 78.0.3904.70-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-l10n-78.0.3904.70-0ubuntu0.18.04.2.md) | Nov 25, 2019 |
| Linux | chromium-browser-l10n Ubuntu 20.04 LTS (focal) | 78.0.3904.70-0ubuntu1 | [chromium-browser-l10n 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-chromium-browser-l10n-78.0.3904.70-0ubuntu1.md) | Sep 3, 2019 |
| Linux | chromium-browser-l10n Ubuntu 24.10 (oracular) | 78.0.3904.70-0ubuntu1 | [chromium-browser-l10n 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-chromium-browser-l10n-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-browser-l10n Ubuntu 25.04 (plucky) | 78.0.3904.70-0ubuntu1 | [chromium-browser-l10n 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-chromium-browser-l10n-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-chromedriver Ubuntu 18.04.6 LTS (bionic) | 78.0.3904.70-0ubuntu0.18.04.2 | [chromium-chromedriver 78.0.3904.70-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-chromedriver-78.0.3904.70-0ubuntu0.18.04.2.md) | Nov 25, 2019 |
| Linux | chromium-chromedriver Ubuntu 20.04 LTS (focal) | 78.0.3904.70-0ubuntu1 | [chromium-chromedriver 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-chromium-chromedriver-78.0.3904.70-0ubuntu1.md) | Sep 3, 2019 |
| Linux | chromium-chromedriver Ubuntu 24.10 (oracular) | 78.0.3904.70-0ubuntu1 | [chromium-chromedriver 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-chromium-chromedriver-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-chromedriver Ubuntu 25.04 (plucky) | 78.0.3904.70-0ubuntu1 | [chromium-chromedriver 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-chromium-chromedriver-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-codecs-ffmpeg Ubuntu 18.04.6 LTS (bionic) | 78.0.3904.70-0ubuntu0.18.04.2 | [chromium-codecs-ffmpeg 78.0.3904.70-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-78.0.3904.70-0ubuntu0.18.04.2.md) | Nov 25, 2019 |
| Linux | chromium-codecs-ffmpeg Ubuntu 20.04 LTS (focal) | 78.0.3904.70-0ubuntu1 | [chromium-codecs-ffmpeg 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-chromium-codecs-ffmpeg-78.0.3904.70-0ubuntu1.md) | Sep 3, 2019 |
| Linux | chromium-codecs-ffmpeg Ubuntu 24.10 (oracular) | 78.0.3904.70-0ubuntu1 | [chromium-codecs-ffmpeg 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-chromium-codecs-ffmpeg-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-codecs-ffmpeg Ubuntu 25.04 (plucky) | 78.0.3904.70-0ubuntu1 | [chromium-codecs-ffmpeg 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-chromium-codecs-ffmpeg-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-codecs-ffmpeg-extra Ubuntu 18.04.6 LTS (bionic) | 78.0.3904.70-0ubuntu0.18.04.2 | [chromium-codecs-ffmpeg-extra 78.0.3904.70-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-extra-78.0.3904.70-0ubuntu0.18.04.2.md) | Nov 25, 2019 |
| Linux | chromium-codecs-ffmpeg-extra Ubuntu 20.04 LTS (focal) | 78.0.3904.70-0ubuntu1 | [chromium-codecs-ffmpeg-extra 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-chromium-codecs-ffmpeg-extra-78.0.3904.70-0ubuntu1.md) | Sep 3, 2019 |
| Linux | chromium-codecs-ffmpeg-extra Ubuntu 24.10 (oracular) | 78.0.3904.70-0ubuntu1 | [chromium-codecs-ffmpeg-extra 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-chromium-codecs-ffmpeg-extra-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | chromium-codecs-ffmpeg-extra Ubuntu 25.04 (plucky) | 78.0.3904.70-0ubuntu1 | [chromium-codecs-ffmpeg-extra 78.0.3904.70-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-chromium-codecs-ffmpeg-extra-78.0.3904.70-0ubuntu1.md) | Sep 4, 2019 |
| Linux | expat RHEL 8 | 0:2.2.5-4.el8 | [RHSA-2020:4484](https://patchblox.com/security/data/fix/linux/rhsa-2020-4484.md) | Nov 4, 2020 |
| Linux | expat Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.2 | [expat 2.2.5-3ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-expat-2.2.5-3ubuntu0.2.md) | Sep 3, 2019 |
| Linux | expat ol 8 | 0:2.2.5-4.el8 | [ELSA-2020-4484](https://patchblox.com/security/data/fix/linux/elsa-2020-4484.md) | Nov 10, 2020 |
| Linux | expat-devel RHEL 8 | 0:2.2.5-4.el8 | [RHSA-2020:4484](https://patchblox.com/security/data/fix/linux/rhsa-2020-4484.md) | Nov 4, 2020 |
| Linux | expat-devel ol 8 | 0:2.2.5-4.el8 | [ELSA-2020-4484](https://patchblox.com/security/data/fix/linux/elsa-2020-4484.md) | Nov 10, 2020 |
| Linux | firefox RHEL 8 | 0:68.2.0-2.el8_0 | [RHSA-2019:3196](https://patchblox.com/security/data/fix/linux/rhsa-2019-3196.md) | Oct 24, 2019 |
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 70.0+build2-0ubuntu0.18.04.1 | [firefox 70.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-70.0-build2-0ubuntu0.18.04.1.md) | Jul 9, 2020 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 70.0+build2-0ubuntu1 | [firefox 70.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-70.0-build2-0ubuntu1.md) | Jul 9, 2020 |
| Linux | firefox Ubuntu 24.10 (oracular) | 70.0+build2-0ubuntu1 | [firefox 70.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-firefox-70.0-build2-0ubuntu1.md) | Sep 4, 2019 |
| Linux | firefox Ubuntu 25.04 (plucky) | 70.0+build2-0ubuntu1 | [firefox 70.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-firefox-70.0-build2-0ubuntu1.md) | Sep 4, 2019 |
| Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 70.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 70.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-70.0-build2-0ubuntu0.18.04.1.md) | Jul 9, 2020 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 70.0+build2-0ubuntu1 | [firefox-geckodriver 70.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-70.0-build2-0ubuntu1.md) | Jul 9, 2020 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 70.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 70.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-70.0-build2-0ubuntu0.18.04.1.md) | Jul 9, 2020 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 70.0+build2-0ubuntu1 | [firefox-mozsymbols 70.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-70.0-build2-0ubuntu1.md) | Jul 9, 2020 |
| Linux | libexpat1 Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.2 | [libexpat1 2.2.5-3ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libexpat1-2.2.5-3ubuntu0.2.md) | Sep 3, 2019 |
| 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 | thunderbird RHEL 8 | 0:68.2.0-1.el8_0 | [RHSA-2019:3237](https://patchblox.com/security/data/fix/linux/rhsa-2019-3237.md) | Oct 29, 2019 |
| Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:68.2.1+build1-0ubuntu0.18.04.1 | [thunderbird 1:68.2.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-68.2.1-build1-0ubuntu0.18.04.1.md) | Oct 22, 2019 |
| Linux | thunderbird Ubuntu 24.10 (oracular) | 1:68.2.0+build1.1-0ubuntu1 | [thunderbird 1:68.2.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-thunderbird-1-68.2.0-build1.1-0ubuntu1.md) | Sep 4, 2019 |
| Linux | thunderbird Ubuntu 25.04 (plucky) | 1:68.2.0+build1.1-0ubuntu1 | [thunderbird 1:68.2.0+build1.1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-thunderbird-1-68.2.0-build1.1-0ubuntu1.md) | Sep 4, 2019 |
| Linux | thunderbird ol 8 | 0:68.2.0-1.0.1.el8_0 | [ELSA-2019-3237](https://patchblox.com/security/data/fix/linux/elsa-2019-3237.md) | Oct 30, 2019 |
| Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:68.2.1+build1-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:68.2.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-68.2.1-build1-0ubuntu0.18.04.1.md) | Oct 22, 2019 |
| Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:68.2.1+build1-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:68.2.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-68.2.1-build1-0ubuntu0.18.04.1.md) | Oct 22, 2019 |
| Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:68.2.1+build1-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:68.2.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-68.2.1-build1-0ubuntu0.18.04.1.md) | Oct 22, 2019 |
| Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:68.2.1+build1-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:68.2.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-68.2.1-build1-0ubuntu0.18.04.1.md) | Oct 22, 2019 |
| Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:68.2.1+build1-0ubuntu0.18.04.1 | [xul-ext-lightning 1:68.2.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-68.2.1-build1-0ubuntu0.18.04.1.md) | Oct 22, 2019 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Python 3.5 | no-fix |
| Windows apps | Python 3.6 | no-fix |

---

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