NVD / CVE Program· CNA GitHub_M

CVE-2026-50010: Netty's wrapping plain trust manager silently disables hostname verification

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.49% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: io.netty:netty-handler (Maven) 4.2.15.Final, 4.1.135.Final; netty (openSUSE:Tumbleweed) 4.1.135-1.1; eap8-eap-product-conf-parent (Red Hat:jboss_enterprise_application_platform:8.1::el10) 0:801.7.1-1.GA_redhat_00001.1.el10eap.

Low priority for now. Upgrade to io.netty:netty-handler (Maven) 4.2.15.Final, 4.1.135.Final; netty (openSUSE:Tumbleweed) 4.1.135-1.1; eap8-eap-product-conf-parent (Red Hat:jboss_enterprise_application_platform:8.1::el10) 0:801.7.1-1.GA_redhat_00001.1.el10eap or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, SimpleTrustManagerFactory.engineGetTrustManagers() and related paths wrap any user-supplied plain X509TrustManager in X509TrustManagerWrapper, which extends X509ExtendedTrustManager but implements the 3-arg checkServerTrusted(chain, authType, SSLEngine) by discarding the SSLEngine and calling the 2-arg delegate. Because the object now IS an X509ExtendedTrustManager, neither SunJSSE's internal AbstractTrustManagerWrapper nor Netty's own OpenSslX509TrustManagerWrapper will re-wrap it to add endpoint-identification. Consequently, even though Netty 4.2 sets endpointIdentificationAlgorithm="HTTPS" by default, a client built with `SslContextBuilder.forClient().trustManager(somePlainX509TrustManager)` performs no hostname verification at all. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Published: Jun 12, 2026
Updated: Sep 18, 2026
EPSS: 0.4% · 42th percentile
CWE: CWE-347

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 7.5; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
netty	netty	cpe:2.3:a:netty:netty

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

netty netty
- >= 4.2.0.Final, < 4.2.15.Final, < 4.1.135.Finalaffected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

netty nettybefore 4.1.135
netty netty4.2.0 and later · before 4.2.15

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

+49

Same product

netty: all records

Other highest-scoring records for the same primary product.

CVE-2026-47691Netty has Insufficient Bailiwick Validation for NS Records
40Plan
CVE-2026-45674Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records
40Plan
CVE-2019-20445HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a…
40Plan

Published before and after this one in the same product

← EarlierCVE-2026-48748Jun 12, 2026 · Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion
30Monitor
← EarlierCVE-2026-50009Jun 12, 2026 · Netty QUIC stateless reset token material exposed through header-visible connection IDs
19Monitor
Later →CVE-2026-50011Jun 12, 2026 · Netty has unbounded pre-allocation in RedisArrayAggregator from RESP array length
30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Maven:io.netty:netty-handler	4.1.135.Final	Package registry (OSV)
Maven:io.netty:netty-handler	4.2.15.Final	Package registry (OSV)
opensuse:netty	4.1.135-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
red hat:eap8-eap-product-conf-parent	0:801.7.1-1.GA_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-eap-product-conf-wildfly-ee-feature-pack	0:801.7.1-1.GA_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-buffer	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-codec	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-codec-dns	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-codec-http	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-codec-socks	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-common	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-handler	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-handler-proxy	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
red hat:eap8-netty-resolver	0:4.1.135-1.Final_redhat_00001.1.el10eap · Red Hat:jboss_enterprise_application_platform:8.1::el10	Package registry (OSV)
suse:netty	4.1.135-150200.4.50.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7	Package registry (OSV)
suse:netty-tcnative	2.0.79-150200.3.45.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: none
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-347 · Improper Verification of Cryptographic Signature

CVSS vector

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

nvd-secondary

Root cause

The verifier takes the algorithm to verify with from the token’s own header. Untrusted data ends up deciding its own verification rule.

The bug in code

The whole CWE-347 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const claims = jwt.verify(token, publicKey);

Fixed

1const claims = jwt.verify(token, publicKey, {
2  algorithms: ["RS256"],
3  issuer: "https://id.example.com",
4  audience: "portal",
5});

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:46 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/netty/netty/releases/tag/netty-4.1.135.Final

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Ecosystem	Package	Affected range	Fix
Debian:12	netty	from 0	—
Maven	io.netty:netty-handler	from 4.2.0.Final · before 4.2.15.Final	4.2.15.Final
Maven	io.netty:netty-handler	before 4.1.135.Final	4.1.135.Final
openSUSE:Tumbleweed	netty	before 4.1.135-1.1	4.1.135-1.1
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-eap-product-conf-parent	before 0:801.7.1-1.GA_redhat_00001.1.el10eap	0:801.7.1-1.GA_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-eap-product-conf-wildfly-ee-feature-pack	before 0:801.7.1-1.GA_redhat_00001.1.el10eap	0:801.7.1-1.GA_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-buffer	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-codec	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-codec-dns	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-codec-http	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-codec-socks	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-common	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-handler	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-handler-proxy	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-resolver	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-resolver-dns	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-transport	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-transport-classes-epoll	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-transport-native-epoll	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-transport-native-epoll-debuginfo	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-netty-transport-native-unix-common	before 0:4.1.135-1.Final_redhat_00001.1.el10eap	0:4.1.135-1.Final_redhat_00001.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-wildfly	before 0:8.1.7.1-1.GA_redhat_00004.1.el10eap	0:8.1.7.1-1.GA_redhat_00004.1.el10eap
Red Hat:jboss_enterprise_application_platform:8.1::el10	eap8-wildfly-java-jdk21	before 0:8.1.7.1-1.GA_redhat_00004.1.el10eap	0:8.1.7.1-1.GA_redhat_00004.1.el10eap