Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 0.35% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-61570High confidence
MPXJ: XXE Vulnerability in MerlinReader
joniles · mpxj
Official source article: GitHub GHSA-5VVX-3H34-F3GJ ↗. Check the applicable product and release in the original source.
7.5HighCVSS 3.1
Within 7 days
Patch availableHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:High, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs joniles mpxj and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Open-source package ranges15 source-attributed ranges
These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.
| Ecosystem and package | Affected range | First fixed version | Evidence |
|---|---|---|---|
| Mavennet.sf.mpxj:mpxj | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗aggregator derived · 1 Oct 2026 |
| NuGetMPXJ.Net | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗aggregator derived · 1 Oct 2026 |
| NuGetnet.sf.mpxj | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗aggregator derived · 1 Oct 2026 |
| NuGetnet.sf.mpxj-for-csharp | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗aggregator derived · 1 Oct 2026 |
| NuGetnet.sf.mpxj-for-vb | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗aggregator derived · 1 Oct 2026 |
| PyPImpxj | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗aggregator derived · 1 Oct 2026 |
| PyPImpxj | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗source linked ecosystem record · 1 Oct 2026 |
| RubyGemsmpxj | ECOSYSTEM: introduced 5.5.5; fixed 16.4.1 | 16.4.1 | OSV record ↗aggregator derived · 1 Oct 2026 |
| mavennet.sf.mpxj:mpxj | >= 5.5.5, < 16.4.1 | 16.4.1 | GitHub advisory ↗upstream repository advisory · 22 Sep 2026 |
| nugetMPXJ.Net | >= 5.5.5, < 16.4.1 | 16.4.1 | GitHub advisory ↗upstream repository advisory · 22 Sep 2026 |
| nugetnet.sf.mpxj | >= 5.5.5, < 16.4.1 | 16.4.1 | GitHub advisory ↗upstream repository advisory · 22 Sep 2026 |
| nugetnet.sf.mpxj-for-csharp | >= 5.5.5, < 16.4.1 | 16.4.1 | GitHub advisory ↗upstream repository advisory · 22 Sep 2026 |
| nugetnet.sf.mpxj-for-vb | >= 5.5.5, < 16.4.1 | 16.4.1 | GitHub advisory ↗upstream repository advisory · 22 Sep 2026 |
| pipmpxj | >= 5.5.5, < 16.4.1 | 16.4.1 | GitHub advisory ↗upstream repository advisory · 22 Sep 2026 |
| rubygemsmpxj | >= 5.5.5, < 16.4.1 | 16.4.1 | GitHub advisory ↗upstream repository advisory · 22 Sep 2026 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-61570 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitynet.sf.mpxj/mpxj: MPXJ: Information disclosure via XML External Entity (XXE) vulnerability in MerlinReader.
The vendor explicitly states that these products are not affected by this CVE.
- All currently supported Red Hat products
- Summary
- A flaw was found in MPXJ. The MerlinReader component, when processing XML from a Merlin project SQLite database, is vulnerable to an XML External Entity (XXE) attack due to default settings that enable doctype declarations and external entities. A remote attacker could exploit this by providing a specially crafted database, which would cause the parser to read arbitrary local files. While the direct disclosure of file contents is unlikely, this vulnerability could still lead to unintended information exposure.
- Remediation
- No remediation text is recorded.
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch available01
What, why and how
MPXJ is an open source library to read and write project plans from a variety of file formats and databases. From 5.5.5 until 16.4.1, MerlinReader creates a DocumentBuilder with default settings while parsing XML from the ZTIMEINTERVALS column of a Merlin project SQLite database, leaving doctype declarations and external entities enabled. A crafted database can cause the parser to read an arbitrary local file, although MPXJ's subsequent handling of the parsed XML makes disclosure of the file contents unlikely. This issue is fixed in version 16.4.1.
What
MPXJ is an open source library to read and write project plans from a variety of file formats and databases. From 5.5.5 until 16.4.1, MerlinReader creates a DocumentBuilder with default settings while parsing XML from the ZTIMEINTERVALS column of a Merlin project SQLite database, leaving doctype declarations and external entities enabled. A crafted database can cause the parser to read an arbitrary local file, although MPXJ's subsequent handling of the parsed XML makes disclosure of the file contents unlikely. This issue is fixed in version 16.4.1.
Why
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
MPXJ is an open source library to read and write project plans from a variety of file formats and databases. From 5.5.5 until 16.4.1, MerlinReader creates a DocumentBuilder with default settings while parsing XML from the ZTIMEINTERVALS column of a Merlin project SQLite database, leaving doctype declarations and external entities enabled. A crafted database can cause the parser to read an arbitrary local file, although MPXJ's subsequent handling of the parsed XML makes disclosure of the file contents unlikely. This issue is fixed in version 16.4.1.
Why
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Improper Restriction of XML External Entity Reference → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-611 ↗
CWE-611: Improper Restriction of XML External Entity Reference. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Affected
- mpxj: 5.5.5, < 16.4.1
- Fixed
- 16.4.1.
- Action
- Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 22 Sept 2026 · Last source change 24 Sept 2026, 15:19 UTC · CWE-611 · Improper Restriction of XML External Entity Reference
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-23
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-84820
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- ENISA EUVD mappingEUVD-2026-84820 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-84820"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
CVE published
Fixed release or patch reference recorded
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.