CVE-2025-58057

Description

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In netty-codec-compression versions 4.1.124.Final and below, and netty-codec versions 4.2.4.Final and below, when supplied with specially crafted input, BrotliDecoder and certain other decompression decoders will allocate a large number of reachable byte buffers, which can lead to denial of service. BrotliDecoder.decompress has no limit in how often it calls pull, decompressing data 64K bytes at a time. The buffers are saved in the output list, and remain reachable until OOM is hit. This is fixed in versions 4.1.125.Final of netty-codec and 4.2.5.Final of netty-codec-compression.

CVSS Metrics

• v4.0•MEDIUM•Score: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
• v4.0•MEDIUM•Score: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.06%• Percentile: 20%

Techniques & Countermeasures

• CWE-409•Improper Handling of Highly Compressed Data (Data Amplification)

  The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.

Affected Systems

• io.netty•netty-codec

  < 4.1.125.Final

• io.netty•netty-codec-compression

  ≥ 4.2.0.Alpha1, < 4.2.5.Final

• netty•netty

  < 4.1.125.Final | < 4.2.5.Final | < 4.1.125 | ≥ 4.2.0, < 4.2.5

References (4)

• https://github.com/netty/netty/security/advisories/GHSA-3p8m-j85q-pgmj
• https://github.com/netty/netty/commit/9d804c54ce962408ae6418255a83a13924f7145d
• https://nvd.nist.gov/vuln/detail/CVE-2025-58057
• https://github.com/netty/netty