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Vulnerabilities

Vulnerability · CVE-2026-33871

Netty is an asynchronous, event-driven network application framework.

Published Mar 27, 2026 · catalog updated Sep 14, 2026 · Netty is an asynchronous,

Check if you run it

No confirmed exploitation is on record for CVE-2026-33871. EPSS is 1.20%. Act only if a listed version of Netty is an asynchronous, is installed.

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 version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.20%
Remediation
Advisory link
Affected products
cpe netty/netty

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of frames. The server's lack of a limit on the number of frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause excessive CPU consumption with minimal bandwidth, rendering the server unresponsive. Versions 4.1.132.Final and 4.2.10.Final fix the issue.

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

How to fix CVE-2026-33871

What to do

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

Should you patch?

No confirmed exploitation is on record for CVE-2026-33871. EPSS is 1.20%. Act only if a listed version of Netty is an asynchronous, is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 1.20%. 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. Mar 27, 2026 · NIST NVD

    Detected

    Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of frames. The server's lack of a limit on the number of frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause exces

  2. Sep 14, 2026 · NIST NVD

    Updated

    Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of frames. The server's lack of a limit on the number of frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause exces

Sources

  • CVE.orgVulnerability recordCVE-2026-33871

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33871

    30-day exploitation probability 1.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33871

    Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of frames. The server's lack of a limit o

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.