CVE-2025-58057Public exploitNetwork attack vector

Service interruption via unbounded decompression buffer retention

Published Sep 3, 2025 · Updated Sep 4, 2025

Denial of service in Netty codecs 4.1.124.Final and earlier and 4.2.4.Final and earlier allows remote attackers to interrupt services. BrotliDecoder.decompress repeatedly calls pull without a limit, expands data in 64 KB chunks, and retains each output buffer until memory is exhausted. Exposure requires an application to pass untrusted compressed input to BrotliDecoder or another affected decoder; the resulting OutOfMemoryError interrupts affected processing.

CVSS severity6.9
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Netty codecs 4.1.124.Final and earlier and 4.2.4.Final and earlier allows remote attackers to interrupt services. BrotliDecoder.decompress repeatedly calls pull without a limit, expands data in 64 KB chunks, and retains each output buffer until memory is exhausted. Exposure requires an application to pass untrusted compressed input to BrotliDecoder or another affected decoder; the resulting OutOfMemoryError interrupts affected processing.

The record

CVE
CVE-2025-58057
Published
Sep 3, 2025
Updated
Sep 4, 2025
Vendor
The Netty Project
Product
Netty
Classifications
CWE-409, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 4.1.124.Final, < 4.1.125.Final
  2. Affected versionversion=<= 4.2.4.Final, < 4.2.5.Final

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Netty Project · Nettyversion=<= 4.1.124.Final, < 4.1.125.Final; version=<= 4.2.4.Final, < 4.2.5.Final

Published CVSS scores

6.9The Netty ProjectCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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