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No exploitation reportedFix available

CVE-2019-15903

No exploitation reported by the sources we read.

  • Published2019-09-04
  • Fixed in3.7.5 · 3.6.10 · 3.5.8 · 2.7.17
  • WeaknessCWE-125 · CWE-776

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-09-0406:15CVE publishedNVD

Versions per branch

NVD
Python
BranchAffectedFixed in
3.7≥ 3.7.0, < 3.7.53.7.5
3.6≥ 3.6.0, < 3.6.103.6.10
3.5≥ 3.5.0, < 3.5.83.5.8
2.7≥ 2.7.0, < 2.7.172.7.17
Libexpat project libexpat
BranchAffectedFixed in
2.2< 2.2.82.2.8

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • chromiumSUSE:Package Hub 15 SP1all versions · fixed in 78.0.3904.70-bp151.3.21.1
  • chromiumSUSE:Package Hub 15 SP1all versions · fixed in 78.0.3904.70-bp151.3.50.1
  • chromiumSUSE:Package Hub 15all versions · fixed in 78.0.3904.70-bp150.240.1
  • chromiumSUSE:Package Hub 12 SP3all versions · fixed in 78.0.3904.87-10.1
  • chromiumopenSUSE:Tumbleweedall versions · fixed in 93.0.4577.82-1.1
  • chromiumopenSUSE:Tumbleweedall versions · fixed in 113.0.5672.92-1.1
  • chromiumopenSUSE:Leap 15.1all versions · fixed in 78.0.3904.70-lp151.2.39.1
  • chromiumopenSUSE:Leap 15.0all versions · fixed in 78.0.3904.70-lp151.2.39.1

223 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-15903 Red Hat Product Security267 products fixed · 24 known affected

    expat: heap-based buffer over-read via crafted XML input

    expat.src as a component of Red Hat Enterprise Linux 5 · firefox.src as a component of Red Hat Enterprise Linux 5 · thunderbird.src as a component of Red Hat Enterprise Linux 5 · +21 more

  • RHSA-2025:22871 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: expat security update

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) · +2 more

  • SSA-398330 Siemens ProductCERT5 known affected

    SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5 · +2 more

  • RHSA-2021:0949 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat OpenShift Do openshift/odo-init-image 1.1.3 security update

  • RHSA-2020:4484 Red Hat Product Security21 products fixed

    Red Hat Security Advisory: expat security update

8 more advisories

Full record on NVD

Fix

  1. Update Python to 3.7.5 · 3.6.10 · 3.5.8 · 2.7.17
  2. Vendor fix Red Hat Product Security RHSA-2025:22871 · 2 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Siemens ProductCERT SSA-398330 · 1 productUpdate to V3.1.5 or later version
  4. Vendor fix CISA ICSA-23-348-10 · 5 productsUpdate to V3.1.5 or later version
  5. Vendor fix Red Hat Product Security RHSA-2021:0949 · 1 productDownload and install a new CLI binary by following the instructions linked from the References section.
  6. Vendor fix Red Hat Product Security RHSA-2020:4484 · 21 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, applications using the Expat library must be restarted for the update to take effect.
  7. Vendor fix Red Hat Product Security RHSA-2020:2646 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. The References section of this erratum contains a download link for the update. You must be logged in to download the update.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2019-09-04
Last Modified
2026-10-14
NVD status
Modified
GitHub Advisory
GHSA-w829-6hpw-frjf

Frequently asked questions

What is CVE-2019-15903?

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.

Is CVE-2019-15903 actively exploited?

Active exploitation of CVE-2019-15903 has not been confirmed. Its EPSS score was 6.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-15903?

CVE-2019-15903 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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