CVE-2019-15903

HIGHEPSS 94th pctl

7.5

CVSS v3

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.

CWE-125Out-of-bounds Read CWE-776

How to fix

Remediation Available

expatAmazon

Fixed in:0:2.1.0-12.amzn2

expat-debuginfoAmazon

Fixed in:0:2.1.0-12.amzn2

expat-develAmazon

Fixed in:0:2.1.0-12.amzn2

expat-staticAmazon

Fixed in:0:2.1.0-12.amzn2

thunderbirdAmazon

Fixed in:0:68.2.0-1.amzn2.0.1

thunderbird-debuginfoAmazon

Fixed in:0:68.2.0-1.amzn2.0.1

expatRocky

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expatRed Hat / RHEL

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expat-debuginfoRocky

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expat-debuginfoRed Hat / RHEL

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expat-debugsourceRed Hat / RHEL

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expat-debugsourceRocky

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expat-develRocky

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expat-develRed Hat / RHEL

Fixed in:0:2.2.10-1.el8_2RHSA-2025:22871

expatUbuntu

Fixed in:2.1.0-4ubuntu1.4+esm2USN-4132-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2.1.0-7ubuntu0.16.04.5USN-4132-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2.2.5-3ubuntu0.2USN-4132-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

firefoxUbuntu

Fixed in:70.0+build2-0ubuntu0.16.04.1USN-4165-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:70.0+build2-0ubuntu0.18.04.1USN-4165-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

lib64expat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4+esm2USN-4132-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2.1.0-7ubuntu0.16.04.5USN-4132-1

This Ubuntu release reached end-of-life on 2021-04-02.

libexpat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4+esm2USN-4132-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2.1.0-7ubuntu0.16.04.5USN-4132-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2.2.5-3ubuntu0.2USN-4132-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

libvtk5.10Ubuntu

Fixed in:5.10.1+dfsg-2.1ubuntu0.1~esm1USN-4852-1

This Ubuntu release reached end-of-life on 2021-04-02.

libvtk5.8Ubuntu

Fixed in:5.8.0-14.1ubuntu3+esm1USN-4852-1

This Ubuntu release reached end-of-life on 2019-04-02.

libxmltokUbuntu

Fixed in:1.2-3ubuntu0.16.04.1~esm2USN-5455-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.2-4ubuntu0.18.04.1~esm4USN-7199-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:1.2-4ubuntu0.18.04.1~esm1USN-5455-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:1.2-4ubuntu0.20.04.1~esm1USN-5455-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:1.2-4ubuntu0.20.04.1~esm4USN-7199-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:1.2-4ubuntu0.22.04.1~esm1USN-5455-1

Fixed in:1.2-4ubuntu0.22.04.1~esm4USN-7199-1

Fixed in:1.2-4.1ubuntu2.24.0.4.1+esm2USN-7199-1

libxmltok1Ubuntu

Fixed in:1.2-3ubuntu0.16.04.1~esm2USN-5455-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.2-4ubuntu0.18.04.1~esm4USN-7199-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:1.2-4ubuntu0.18.04.1~esm1USN-5455-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:1.2-4ubuntu0.20.04.1~esm4USN-7199-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:1.2-4ubuntu0.20.04.1~esm1USN-5455-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:1.2-4ubuntu0.22.04.1~esm1USN-5455-1

Fixed in:1.2-4ubuntu0.22.04.1~esm4USN-7199-1

libxmltok1t64Ubuntu

Fixed in:1.2-4.1ubuntu2.24.0.4.1+esm2USN-7199-1

thunderbirdUbuntu

Fixed in:1:68.7.0+build1-0ubuntu0.16.04.2USN-4335-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1:68.2.1+build1-0ubuntu0.18.04.1USN-4202-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

vtkUbuntu

Fixed in:5.8.0-14.1ubuntu3+esm1USN-4852-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:5.10.1+dfsg-2.1ubuntu0.1~esm1USN-4852-1

This Ubuntu release reached end-of-life on 2021-04-02.

Python 2Windows application

Affected:3.7.0 3.7.5Fixed in:3.7.5Python Software Foundation

Affected:2.7.0 2.7.17Fixed in:2.7.17Python Software Foundation

Affected:3.6.0 3.6.10Fixed in:3.6.10Python Software Foundation

Affected:3.5.0 3.5.8Fixed in:3.5.8Python Software Foundation

Python 3.10Windows application

Affected:3.6.0 3.6.10Fixed in:3.6.10Python Software Foundation

Affected:2.7.0 2.7.17Fixed in:2.7.17Python Software Foundation

Affected:3.7.0 3.7.5Fixed in:3.7.5Python Software Foundation

Affected:3.5.0 3.5.8Fixed in:3.5.8Python Software Foundation

Python 3.11Windows application

Affected:3.6.0 3.6.10Fixed in:3.6.10Python Software Foundation

Affected:3.5.0 3.5.8Fixed in:3.5.8Python Software Foundation

Affected:2.7.0 2.7.17Fixed in:2.7.17Python Software Foundation

Affected:3.7.0 3.7.5Fixed in:3.7.5Python Software Foundation

Python 3.12Windows application

Affected:3.6.0 3.6.10Fixed in:3.6.10Python Software Foundation

Affected:3.7.0 3.7.5Fixed in:3.7.5Python Software Foundation

Affected:3.5.0 3.5.8Fixed in:3.5.8Python Software Foundation

Affected:2.7.0 2.7.17Fixed in:2.7.17Python Software Foundation

Python 3.8Windows application

Affected:3.6.0 3.6.10Fixed in:3.6.10Python Software Foundation

Affected:3.5.0 3.5.8Fixed in:3.5.8Python Software Foundation

Affected:2.7.0 2.7.17Fixed in:2.7.17Python Software Foundation

Affected:3.7.0 3.7.5Fixed in:3.7.5Python Software Foundation

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

6.64%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Patch2

Exploit1

github.com

Third-Party Advisory44

Other references3

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV + Ransom	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix
CVE-2023-21769	High	7.5	89%	-	Fix
CVE-2023-49285	High	8.6	88%	-	Fix

Common questions

How do I fix CVE-2019-15903?

Published advisories record a fix for 31 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2019-15903 being actively exploited?

Not that we know of. CVE-2019-15903 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 6.6% is the estimated probability that it will be exploited in the next 30 days. That is higher than 94% of all scored CVEs.

How severe is CVE-2019-15903?

CVE-2019-15903 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2019-15903 affect?

Published advisories record a fix for expat (Amazon), expat-debuginfo (Amazon), expat-devel (Amazon), expat-static (Amazon), and 27 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.