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Review reviewHigh

CVE-2026-48059

netty netty, Cryostat 4 on RHEL 9, Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, the HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested `PP2_TYPE_SSL` TLVs (type-length-value records) at depth two or greater. The leak occurs on the successful parse path — no exception is thrown, the message fires downstream, the decoder removes itself, and the application releases the `HAProxyMessage` normally. Yet the underlying cumulation buffe...

CVSS
8.7
EPSS
0.63%
46.7% percentile
CISA KEV
Not listed
Published
2026.06.13
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.63%
Technical severityCVSS 8.7

Vulnerability overview

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, the HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested `PP2_TYPE_SSL` TLVs (type-length-value records) at depth two or greater. The leak occurs on the successful parse path — no exception is thrown, the message fires downstream, the decoder removes itself, and the application releases the `HAProxyMessage` normally. Yet the underlying cumulation buffe...

Affected product and versions

Product
netty netty, Cryostat 4 on RHEL 9, Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1
Affected versions
>= >= 4.2.0.Final, < 4.2.15.Final, >= < 4.1.135.Final, < 4.1.135, >= 4.2.0 < 4.2.15
Fixed versions
4.1.135, 4.2.15

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that netty netty, Cryostat 4 on RHEL 9, Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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
CWE
CWE-1286, CWE-401