CVE-2026-59901
Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the `Bzip2Decoder` handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop. The vulnerability exists in the run-length encoding (RLE) state machine within [`Bzip2BlockDecompressor.read()`]. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
| CWE | CWE-835 |
| Vendor | netty |
| Product | netty |
| Published | Jul 29, 2026 |
| Last Updated | Jul 29, 2026 |
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Affected Versions
netty / netty
>=4.2.0.Final, < 4.2.16.Final < 4.1.136.Final