XML External Entity (XXE) Injection Affecting org.mapfish.print:print-lib package, versions [3.0.0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JAVA-ORGMAPFISHPRINT-19456648
- published1 Sept 2026
- disclosed28 Aug 2026
- creditzneek
Introduced: 28 Aug 2026
NewCVE-2026-55848 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
org.mapfish.print:print-lib is a component of MapFish for printing templated cartographic maps.
Affected versions of this package are vulnerable to XML External Entity (XXE) Injection in the GML layer processing of the print report endpoint (buildreport.pdf), which parses GML XML without disabling external entity expansion. An attacker can read arbitrary files of certain types, such as /etc/passwd, Kubernetes secrets, or certificates, and reach internal services through blind SSRF by submitting a GML layer URL that points to XML containing an external entity, whose expanded content is reflected back in the 404 error path. This requires the print API to be reachable with GML layer support enabled, and exfiltration depends on the error response reflecting the expanded content and on file-type restrictions that bound which files can be disclosed.
Details
XXE Injection is a type of attack against an application that parses XML input. XML is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. By default, many XML processors allow specification of an external entity, a URI that is dereferenced and evaluated during XML processing. When an XML document is being parsed, the parser can make a request and include the content at the specified URI inside of the XML document.
Attacks can include disclosing local files, which may contain sensitive data such as passwords or private user data, using file: schemes or relative paths in the system identifier.
For example, below is a sample XML document, containing an XML element- username.
<xml>
<?xml version="1.0" encoding="ISO-8859-1"?>
<username>John</username>
</xml>
An external XML entity - xxe, is defined using a system identifier and present within a DOCTYPE header. These entities can access local or remote content. For example the below code contains an external XML entity that would fetch the content of /etc/passwd and display it to the user rendered by username.
<xml>
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [
<!ENTITY xxe SYSTEM "file:///etc/passwd" >]>
<username>&xxe;</username>
</xml>
Other XXE Injection attacks can access local resources that may not stop returning data, possibly impacting application availability and leading to Denial of Service.