CVE-2026-42582

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published5/13/2026

Last Modified5/13/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-770CWE-789

References

https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw(security-advisories@github.com)

https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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