CVE-2026-33871

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Source
https://cve.org/CVERecord?id=CVE-2026-33871
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33871.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33871
Aliases
Downstream
Related
Published
2026-03-27T19:55:23.135Z
Modified
2026-04-02T13:29:16.632756Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass
Details

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 CONTINUATION frames. The server's lack of a limit on the number of CONTINUATION 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33871.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770"
    ]
}
References

Affected packages

Git / github.com/netty/netty

Affected ranges

Type
GIT
Repo
https://github.com/netty/netty
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ec119d487b3a27e4ac118e7e1d97f0c96a85f4a3
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.1.132.Final"
        }
    ]
}
Type
GIT
Repo
https://github.com/netty/netty
Events
Introduced
5451fbb0effd8460f57013bb33aefeb953144ed9
Fixed
4cc98736c3947bc93122e0b64e0bd8fc970c6437
Database specific 
{
    "versions": [
        {
            "introduced": "4.2.0.Alpha1"
        },
        {
            "fixed": "4.2.10.Final"
        }
    ]
}

Affected versions

netty-3.*
netty-3.10.0.Final
netty-3.10.1.Final
netty-3.10.2.Final
netty-3.10.3.Final
netty-3.10.4.Final
netty-3.10.5.Final
netty-3.10.6.Final
netty-3.2.10.Final
netty-3.2.4.Final
netty-3.2.5.Final
netty-3.2.6.Final
netty-3.2.7.Final
netty-3.2.8.Final
netty-3.2.9.Final
netty-3.3.0.Final
netty-3.3.1.Final
netty-3.4.0.Alpha1
netty-3.4.0.Alpha2
netty-3.4.0.Beta1
netty-3.4.0.Final
netty-3.4.1.Final
netty-3.4.2.Final
netty-3.4.3.Final
netty-3.4.4.Final
netty-3.4.5.Final
netty-3.4.6.Final
netty-3.5.0.Beta1
netty-3.5.0.Final
netty-3.5.1.Final
netty-3.5.10.Final
netty-3.5.11.Final
netty-3.5.12.Final
netty-3.5.13.Final
netty-3.5.2.Final
netty-3.5.3.Final
netty-3.5.4.Final
netty-3.5.5.Final
netty-3.5.6.Final
netty-3.5.7.Final
netty-3.5.8.Final
netty-3.5.9.Final
netty-3.6.0.Beta1
netty-3.6.0.Final
netty-3.6.1.Final
netty-3.6.10.Final
netty-3.6.2.Final
netty-3.6.3.Final
netty-3.6.4.Final
netty-3.6.5.Final
netty-3.6.6.Final
netty-3.6.7.Final
netty-3.6.8.Final
netty-3.6.9.Final
netty-3.7.0.Final
netty-3.7.1.Final
netty-3.8.0.Final
netty-3.8.1.Final
netty-3.8.2.Final
netty-3.8.3.Final
netty-3.9.0.Final
netty-3.9.1.1.Final
netty-3.9.1.Final
netty-3.9.2.Final
netty-3.9.3.Final
netty-3.9.4.Final
netty-3.9.5.Final
netty-3.9.6.Final
netty-3.9.7.Final
netty-3.9.8.Final
netty-3.9.9.Final
netty-4.*
netty-4.0.0.Alpha1
netty-4.0.0.Alpha2
netty-4.0.0.Alpha3
netty-4.0.0.Alpha4
netty-4.0.0.Alpha5
netty-4.0.0.Alpha6
netty-4.0.0.Alpha7
netty-4.0.0.Alpha8
netty-4.0.0.Beta1
netty-4.0.0.Beta2
netty-4.0.0.Beta3
netty-4.0.0.CR1
netty-4.0.0.CR2
netty-4.0.0.CR3
netty-4.0.0.CR4
netty-4.0.0.CR5
netty-4.0.0.CR6
netty-4.0.0.CR7
netty-4.0.0.CR8
netty-4.0.0.CR9
netty-4.0.0.Final
netty-4.0.1.Final
netty-4.0.10.Final
netty-4.0.11.Final
netty-4.0.12.Final
netty-4.0.13.Final
netty-4.0.14.Beta1
netty-4.0.14.Final
netty-4.0.15.Final
netty-4.0.16.Final
netty-4.0.17.Final
netty-4.0.18.Final
netty-4.0.19.Final
netty-4.0.2.Final
netty-4.0.20.Final
netty-4.0.21.Final
netty-4.0.22.Final
netty-4.0.23.Final
netty-4.0.24.Final
netty-4.0.25.Final
netty-4.0.26.Final
netty-4.0.27.Final
netty-4.0.28.Final
netty-4.0.29.Final
netty-4.0.3.Final
netty-4.0.30.Final
netty-4.0.31.Final
netty-4.0.32.Final
netty-4.0.33.Final
netty-4.0.34.Final
netty-4.0.35.Final
netty-4.0.36.Final
netty-4.0.37.Final
netty-4.0.38.Final
netty-4.0.39.Final
netty-4.0.4.Final
netty-4.0.40.Final
netty-4.0.41.Final
netty-4.0.42.Final
netty-4.0.43.Final
netty-4.0.44.Final
netty-4.0.45.Final
netty-4.0.46.Final
netty-4.0.47.Final
netty-4.0.48.Final
netty-4.0.49.Final
netty-4.0.5.Final
netty-4.0.50.Final
netty-4.0.51.Final
netty-4.0.52.Final
netty-4.0.53.Final
netty-4.0.54.Final
netty-4.0.55.Final
netty-4.0.56.Final
netty-4.0.6.Final
netty-4.0.7.Final
netty-4.0.8.Final
netty-4.0.9.Final
netty-4.1.0.Beta1
netty-4.1.0.Beta2
netty-4.1.0.Beta3
netty-4.1.0.Beta4
netty-4.1.0.Beta5
netty-4.1.0.Beta6
netty-4.1.0.Beta7
netty-4.1.0.Beta8
netty-4.1.0.CR1
netty-4.1.0.CR2
netty-4.1.0.CR3
netty-4.1.0.CR4
netty-4.1.0.CR5
netty-4.1.0.CR6
netty-4.1.0.CR7
netty-4.1.0.Final
netty-4.1.1.Final
netty-4.1.10.Final
netty-4.1.100.Final
netty-4.1.101.Final
netty-4.1.102.Final
netty-4.1.103.Final
netty-4.1.104.Final
netty-4.1.105.Final
netty-4.1.106.Final
netty-4.1.107.Final
netty-4.1.108.Final
netty-4.1.109.Final
netty-4.1.11.Final
netty-4.1.110.Final
netty-4.1.111.Final
netty-4.1.112.Final
netty-4.1.113.Final
netty-4.1.114.Final
netty-4.1.115.Final
netty-4.1.116.Final
netty-4.1.117.Final
netty-4.1.118.Final
netty-4.1.119.Final
netty-4.1.12.Final
netty-4.1.120.Final
netty-4.1.121.Final
netty-4.1.122.Final
netty-4.1.123.Final
netty-4.1.124.Final
netty-4.1.125.Final
netty-4.1.126.Final
netty-4.1.127.Final
netty-4.1.128.Final
netty-4.1.129.Final
netty-4.1.13.Final
netty-4.1.130.Final
netty-4.1.131.Final
netty-4.1.14.Final
netty-4.1.15.Final
netty-4.1.16.Final
netty-4.1.17.Final
netty-4.1.18.Final
netty-4.1.19.Final
netty-4.1.2.Final
netty-4.1.20.Final
netty-4.1.21.Final
netty-4.1.22.Final
netty-4.1.23.Final
netty-4.1.24.Final
netty-4.1.25.Final
netty-4.1.26.Final
netty-4.1.27.Final
netty-4.1.28.Final
netty-4.1.29.Final
netty-4.1.3.Final
netty-4.1.30.Final
netty-4.1.31.Final
netty-4.1.32.Final
netty-4.1.33.Final
netty-4.1.34.Final
netty-4.1.35.Final
netty-4.1.36.Final
netty-4.1.37.Final
netty-4.1.38.Final
netty-4.1.39.Final
netty-4.1.4.Final
netty-4.1.40.Final
netty-4.1.41.Final
netty-4.1.42.Final
netty-4.1.43.Final
netty-4.1.44.Final
netty-4.1.45.Final
netty-4.1.46.Final
netty-4.1.47.Final
netty-4.1.48.Final
netty-4.1.49.Final
netty-4.1.5.Final
netty-4.1.50.Final
netty-4.1.51.Final
netty-4.1.52.Final
netty-4.1.53.Final
netty-4.1.54.Final
netty-4.1.55.Final
netty-4.1.56.Final
netty-4.1.57.Final
netty-4.1.58.Final
netty-4.1.59.Final
netty-4.1.6.Final
netty-4.1.60.Final
netty-4.1.61.Final
netty-4.1.62.Final
netty-4.1.63.Final
netty-4.1.64.Final
netty-4.1.65.Final
netty-4.1.66.Final
netty-4.1.67.Final
netty-4.1.68.Final
netty-4.1.69.Final
netty-4.1.7.Final
netty-4.1.70.Final
netty-4.1.71.Final
netty-4.1.72.Final
netty-4.1.73.Final
netty-4.1.74.Final
netty-4.1.75.Final
netty-4.1.76.Final
netty-4.1.77.Final
netty-4.1.78.Final
netty-4.1.79.Final
netty-4.1.8.Final
netty-4.1.80.Final
netty-4.1.81.Final
netty-4.1.82.Final
netty-4.1.83.Final
netty-4.1.84.Final
netty-4.1.85.Final
netty-4.1.86.Final
netty-4.1.87.Final
netty-4.1.88.Final
netty-4.1.89.Final
netty-4.1.9.Final
netty-4.1.90.Final
netty-4.1.91.Final
netty-4.1.92.Final
netty-4.1.93.Final
netty-4.1.94.Final
netty-4.1.95.Final
netty-4.1.96.Final
netty-4.1.97.Final
netty-4.1.98.Final
netty-4.1.99.Final
netty-4.2.0.Alpha1
netty-4.2.0.Alpha2
netty-4.2.0.Alpha3
netty-4.2.0.Alpha4
netty-4.2.0.Alpha5
netty-4.2.0.Alpha6
netty-4.2.0.Beta1
netty-4.2.0.Final
netty-4.2.0.RC1
netty-4.2.0.RC2
netty-4.2.0.RC3
netty-4.2.0.RC4
netty-4.2.1.Final
netty-4.2.10.Final
netty-4.2.11.Final
netty-4.2.12.Final
netty-4.2.2.Final
netty-4.2.3.Final
netty-4.2.4.Final
netty-4.2.5.Final
netty-4.2.6.Final
netty-4.2.7.Final
netty-4.2.8.Final
netty-4.2.9.Final
netty-5.*
netty-5.0.0.Alpha1
netty-5.0.0.Alpha2
netty-5.0.0.Alpha3
netty-5.0.0.Alpha4
netty-5.0.0.Alpha5
Other
netty-tag

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33871.json"