ZDF
Sign inSign up

Vulnerabilities

Security fix · CVE-2025-58056

Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients.

Published Sep 3, 2025 · catalog updated Oct 19, 2026 · Netty is an asynchronous

Check this week

CVE-2025-58056 is not in CISA KEV. FIRST estimates a 71.00% chance of exploitation in the next 30 days. Check whether you run Netty is an asynchronous.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Netty is an asynchronous).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low2.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
71.00%
Remediation
Version ranges on file
Affected products
cpe netty/netty · vendor netty netty ≤ 4.1.124.Final, < 4.1.125.Final

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe netty/nettyversion unspecified
  • vendor netty netty ≤ 4.1.124.Final, < 4.1.125.Final≤ 4.1.124.Final, < 4.1.125.Final

How to fix CVE-2025-58056

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-58056 is not in CISA KEV. FIRST estimates a 71.00% chance of exploitation in the next 30 days. Check whether you run Netty is an asynchronous.

Which versions are affected?

Compare what you have installed with netty netty ≤ 4.1.124.Final, < 4.1.125.Final ≤ 4.1.124.Final, < 4.1.125.Final. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-444: HTTP Request Smuggling. EPSS 71.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 3, 2025 · NIST NVD

    Detected

    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 standar

  2. Oct 19, 2026 · NIST NVD

    Updated

    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 standar

Sources

  • CVE.orgVulnerability recordCVE-2025-58056

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-26640

    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 ch

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-58056

    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 ch

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 19, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.