CVE-2026-56819

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Source

https://cve.org/CVERecord?id=CVE-2026-56819

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56819.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-56819

Aliases

GHSA-93wv-jw9v-4972

Downstream

DEBIAN-CVE-2026-56819

Published

2026-07-21T22:11:17.470Z

Modified

2026-07-23T04:03:10.032321751Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

Netty: HTTP/2 decompression leaks ByteBuf reference count when the decompressor channel is already closed (Direct memory leak / OOM DoS)

Details

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, a remote unauthenticated peer can leak one direct ByteBuf per HTTP/2 DATA frame in applications that enable HTTP/2 content decompression via DelegatingDecompressorFrameListener. When a DATA frame is processed for a stream whose decompressor has already been closed, Http2Decompressor.decompress(...) calls decompressor.writeInbound(data.retain()) and does not release the retained buffer on the error path, eventually exhausting direct memory and crashing the JVM. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56819.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400",
        "CWE-401"
    ]
}

References

Affected packages

Git / github.com/netty/netty

Affected ranges

Type

GIT

Repo

https://github.com/netty/netty

Events

Introduced

09e64d259c99be8b5b2a471a78f11e65eb82598a

Fixed

3703d79669ee024f6483c9d8697ac58ba546df33

Introduced

446b38db5220a3934064ee4e26f40d81dfa6b714

Fixed

fca0764703b3bb59c6e6dc5d29c6d9710d35c0e6

Database specific

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "4.2.0.Final"
        },
        {
            "fixed": "4.2.16.Final"
        },
        {
            "introduced": "4.1.0.Final"
        },
        {
            "fixed": "4.1.136.Final"
        }
    ]
}

Affected versions

netty-4.*

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-4.1.132.Final

netty-4.1.133.Final

netty-4.1.134.Final

netty-4.1.135.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.Final

netty-4.2.1.Final

netty-4.2.10.Final

netty-4.2.11.Final

netty-4.2.12.Final

netty-4.2.13.Final

netty-4.2.14.Final

netty-4.2.15.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

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56819.json"