Is CVE-2026-42582 actively exploited?

No active exploitation of CVE-2026-42582 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42582 be exploited remotely?

Yes. CVE-2026-42582 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42582?

CVE-2026-42582 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-42582

HIGH

CVE-2026-42582

CWE-770Published: May 13, 2026· Updated: May 18, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42582 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.