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.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw
Scores
CVSS v3
7.5
EPSS
0.0044
EPSS Percentile
34.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-770
CWE-789
Status
published
Products (4)
io.netty/netty-codec-http3
0 - 4.2.13.FinalMaven
io.netty/netty-codec-http3
>= 4.2.0.Alpha1, < 4.2.13.Final
netty/netty
< 4.2.13
netty/netty
>= 4.2.0.Alpha1, < 4.2.13.Final
Published
May 13, 2026
Tracked Since
May 14, 2026