CVE•Published 2026-05-13•Modified 2026-05-18•0 articles on news•5 live references•NVD data

CVE-2026-42582Netty · Netty

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

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Weaknesses (CWE)

CWE-770Allocation of Resources Without Limits or Throttling CWE-789Memory Allocation with Excessive Size Value

Description

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.

Timeline

Published 2026-05-13

Modified 2026-05-18

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-42582

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Netty Netty"

All exposed Netty Netty instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Netty"

HTTP body or banner mentions "Netty" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42582