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Vulnerability Details :

CVE-2026-56817

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-21 Jul, 2026 | 22:06
Updated At-22 Jul, 2026 | 15:42
Rejected At-
Credits

Netty: XML External Entity (XXE) injection via unconfigured XML factory when DTD and entity processing are enabled

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing `XmlDecoder` can send XML with a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:21 Jul, 2026 | 22:06
Updated At:22 Jul, 2026 | 15:42
Rejected At:
▼CVE Numbering Authority (CNA)
Netty: XML External Entity (XXE) injection via unconfigured XML factory when DTD and entity processing are enabled

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing `XmlDecoder` can send XML with a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Affected Products
Vendor
The Netty Projectnetty
Product
netty
Versions
Affected
  • >= 4.2.0.Final, < 4.2.16.Final
  • >= 4.1.0.Final, < 4.1.136.Final
Problem Types
TypeCWE IDDescription
CWECWE-611CWE-611: Improper Restriction of XML External Entity Reference
Type: CWE
CWE ID: CWE-611
Description: CWE-611: Improper Restriction of XML External Entity Reference
Metrics
VersionBase scoreBase severityVector
4.08.3HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
Version: 4.0
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/netty/netty/security/advisories/GHSA-4qhr-g3c6-fcfx
x_refsource_CONFIRM
https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b
x_refsource_MISC
https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
x_refsource_MISC
https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
x_refsource_MISC
https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
x_refsource_MISC
Hyperlink: https://github.com/netty/netty/security/advisories/GHSA-4qhr-g3c6-fcfx
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b
Resource:
x_refsource_MISC
Hyperlink: https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
Resource:
x_refsource_MISC
Hyperlink: https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
Resource:
x_refsource_MISC
Hyperlink: https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:21 Jul, 2026 | 23:17
Updated At:22 Jul, 2026 | 20:35

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing `XmlDecoder` can send XML with a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.3HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
N/A
Type: Secondary
Version: 4.0
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-611Secondarysecurity-advisories@github.com
CWE ID: CWE-611
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bsecurity-advisories@github.com
N/A
https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6security-advisories@github.com
N/A
https://github.com/netty/netty/releases/tag/netty-4.1.136.Finalsecurity-advisories@github.com
N/A
https://github.com/netty/netty/releases/tag/netty-4.2.16.Finalsecurity-advisories@github.com
N/A
https://github.com/netty/netty/security/advisories/GHSA-4qhr-g3c6-fcfxsecurity-advisories@github.com
N/A
Hyperlink: https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/netty/netty/security/advisories/GHSA-4qhr-g3c6-fcfx
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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