CVE-2026-42582

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Source
https://cve.org/CVERecord?id=CVE-2026-42582
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42582.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42582
Aliases
Downstream
Related
Published
2026-05-13T18:06:55.559Z
Modified
2026-07-15T01:49:09.251642509Z
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/3 QPACK literal unbounded allocation
Details

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final, when decoding header blocks, the non-Huffman branch of io.netty.handler.codec.http3.QpackDecoder#decodeHuffmanEncodedLiteral may execute new byte[length] for a string literal before verifying that length bytes are actually present in the compressed field section. The wire encoding allows a very large length to be expressed in few bytes. There is no check that length <= in.readableBytes() before new byte[length]. This vulnerability is fixed in 4.2.13.Final.

Database specific 
{
    "cwe_ids": [
        "CWE-770",
        "CWE-789"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42582.json"
}
References

Affected packages

Git / github.com/netty/netty

Affected ranges

Type
GIT
Repo
https://github.com/netty/netty
Events
Introduced
5451fbb0effd8460f57013bb33aefeb953144ed9
Fixed
b3844c8108b42f68d56144b36d4d1ed96078a688
Database specific 
{
    "cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "4.2.0.Alpha1"
        },
        {
            "fixed": "4.2.13.Final"
        },
        {
            "introduced": "4.2.0"
        },
        {
            "fixed": "4.2.13"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

netty-4.*
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.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

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42582.json"