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NVD / CVE Program· CNA GitHub_M

CVE-2025-58056: Netty is vulnerable to request smuggling due to incorrect parsing of chunk extensions

LowCVSS 2.9 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 11/100)

  • 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: 0.71% (FIRST EPSS); higher than 53.9% of all records.
  • 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.
  • Fixed version: netty (Debian:11) 1:4.1.48-4+deb11u3; netty (Debian:12) 1:4.1.48-7+deb12u2; netty (Debian:13) 1:4.1.48-10+deb13u1.

Low priority for now. Upgrade to netty (Debian:11) 1:4.1.48-4+deb11u3; netty (Debian:12) 1:4.1.48-7+deb12u2; netty (Debian:13) 1:4.1.48-10+deb13u1 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 an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.

Published
Sep 3, 2025
Updated
Oct 19, 2026
EPSS
0.7% · 53th percentile

Report tools

JSON

Action score

11

Monitor

Low priority for now.

CVSS
11 / 40 · 2.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
2.9
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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.

Follow CVE-2025-58056

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
nettynetty

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.Alpha3, < 4.2.5.Final, <= 4.1.124.Final, < 4.1.125.Finalaffected

Affected versions

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

  • netty nettybefore 4.1.125
  • netty netty4.2.0 and later · before 4.2.5

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:11nettybefore 1:4.1.48-4+deb11u31:4.1.48-4+deb11u3
Debian:12nettybefore 1:4.1.48-7+deb12u21:4.1.48-7+deb12u2
Debian:13nettybefore 1:4.1.48-10+deb13u11:4.1.48-10+deb13u1
Debian:14nettybefore 1:4.1.48-131:4.1.48-13
Mavenio.netty:netty-codec-httpfrom 4.2.0.Alpha1 · before 4.2.5.Final4.2.5.Final
Mavenio.netty:netty-codec-httpbefore 4.1.125.Final4.1.125.Final
openSUSE:Leap 15.6nettybefore 4.1.126-150200.4.34.14.1.126-150200.4.34.1
openSUSE:Leap 15.6netty-tcnativebefore 2.0.73-150200.3.30.12.0.73-150200.3.30.1
openSUSE:Tumbleweednettybefore 4.1.126-1.14.1.126-1.1
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-apache-cxfbefore 0:4.0.9-5.redhat_00002.1.el8eap0:4.0.9-5.redhat_00002.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-apache-cxf-rtbefore 0:4.0.9-5.redhat_00002.1.el8eap0:4.0.9-5.redhat_00002.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-apache-cxf-servicesbefore 0:4.0.9-5.redhat_00002.1.el8eap0:4.0.9-5.redhat_00002.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-apache-cxf-toolsbefore 0:4.0.9-5.redhat_00002.1.el8eap0:4.0.9-5.redhat_00002.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-apache-cxf-xjc-utilsbefore 0:4.1.0-1.redhat_00001.1.el8eap0:4.1.0-1.redhat_00001.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-cxf-xjc-booleanbefore 0:4.1.0-1.redhat_00001.1.el8eap0:4.1.0-1.redhat_00001.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-cxf-xjc-bug986before 0:4.1.0-1.redhat_00001.1.el8eap0:4.1.0-1.redhat_00001.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-cxf-xjc-dvbefore 0:4.1.0-1.redhat_00001.1.el8eap0:4.1.0-1.redhat_00001.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-cxf-xjc-runtimebefore 0:4.1.0-1.redhat_00001.1.el8eap0:4.1.0-1.redhat_00001.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-cxf-xjc-tsbefore 0:4.1.0-1.redhat_00001.1.el8eap0:4.1.0-1.redhat_00001.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-eap-product-conf-parentbefore 0:800.9.1-3.GA_redhat_00004.1.el8eap0:800.9.1-3.GA_redhat_00004.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-eap-product-conf-wildfly-ee-feature-packbefore 0:800.9.1-3.GA_redhat_00004.1.el8eap0:800.9.1-3.GA_redhat_00004.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-wildflybefore 0:8.0.9-8.GA_redhat_00008.1.el8eap0:8.0.9-8.GA_redhat_00008.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-wildfly-java-jdk11before 0:8.0.9-8.GA_redhat_00008.1.el8eap0:8.0.9-8.GA_redhat_00008.1.el8eap
Red Hat:jboss_enterprise_application_platform:8.0::el8eap8-wildfly-java-jdk17before 0:8.0.9-8.GA_redhat_00008.1.el8eap0:8.0.9-8.GA_redhat_00008.1.el8eap

+96

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-2025-25193Feb 10, 2025 · Denial of Service attack on windows app using Netty
    22Monitor
  • ← EarlierCVE-2025-55163Aug 13, 2025 · Netty MadeYouReset HTTP/2 DDoS Vulnerability
    32Monitor
  • Later →CVE-2025-58057Sep 4, 2025 · Netty's BrotliDecoder is vulnerable to DoS via zip bomb style attack
    27Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
debian:netty1:4.1.48-7+deb12u2 · Debian:12Package registry (OSV)
Maven:io.netty:netty-codec-http4.1.125.FinalPackage registry (OSV)
Maven:io.netty:netty-codec-http4.2.5.FinalPackage registry (OSV)
opensuse:netty4.1.126-150200.4.34.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:netty-tcnative2.0.73-150200.3.30.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:eap8-apache-commons-lang0:3.18.0-1.redhat_00002.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-apache-cxf0:4.0.9-4.redhat_00002.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-apache-cxf-rt0:4.0.9-4.redhat_00002.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-apache-cxf-services0:4.0.9-4.redhat_00002.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-apache-cxf-tools0:4.0.9-4.redhat_00002.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-eap-product-conf-parent0:801.0.1-2.GA_redhat_00003.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-eap-product-conf-wildfly-ee-feature-pack0:801.0.1-2.GA_redhat_00003.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-jbossws-cxf0:7.3.4-1.Final_redhat_00001.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-netty0:4.1.127-1.Final_redhat_00001.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-netty-buffer0:4.1.127-1.Final_redhat_00001.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-netty-codec0:4.1.127-1.Final_redhat_00001.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
red hat:eap8-netty-codec-dns0:4.1.127-1.Final_redhat_00001.1.el8eap · Red Hat:jboss_enterprise_application_platform:8.1::el8Package registry (OSV)
suse:netty4.1.126-150200.4.34.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP6Package registry (OSV)
suse:netty-tcnative2.0.73-150200.3.30.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package 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.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-42581252 days apartNetty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
    39Monitor
  • CVE-2026-42584252 days apartNetty: HttpClientCodec response desynchronization
    36Monitor
  • CVE-2026-33870205 days apartNetty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing
    30Monitor
  • CVE-2026-42585252 days apartNetty: HTTP Request Smuggling due to malformed Transfer-Encoding
    30Monitor
  • CVE-2026-59900329 days apartNetty codec-http2: Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass
    27Monitor
  • CVE-2026-89044372 days apartNetty 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final HTTP Request Smuggling via Transfer-Encoding
    27Monitor

Not on record for this CVE: EPSS history · researcher credit · 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
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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

nvd-secondary

Attack context

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

ATT&CK techniques

—

References

Show all references (5 more)

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

All records