CVE-2026-59901 — Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang

CVE-2026-59901

Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
netty / netty	affected >=4.2.0.Final, < 4.2.16.Final; affected < 4.1.136.Final

CWE

CWE-835

References

https://github.com/netty/netty/security/advisories/GHSA-558v-64gr-wgg4

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.