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CVE-2026-59919 Netty

Affected softwareNetty
Severity5.5 Medium CVSS 3.1
Fixed in4.2.16.Final, 4.1.136.Final
WeaknessCWE-93
Published29 Jul 2026
Updated6 Aug 2026

Description

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject  \r\n  sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: no, technical impact: partial.
  • Indexed PoC none indexed
  • EPSS 0.17% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/netty/netty/security/advisories/GHSA-wh89-7897-x99h : the maintainers' own security advisory: names the version that fixes it, so the fix is the difference between two releases

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Communications / Core (Netty) (6.1.1-7.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Core (Netty) 6.1.1-7.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.netty:netty-codec-haproxy 4.2.0.Final 4.2.16.Final unbounded
io.netty:netty-codec-haproxy 0 4.1.136.Final unbounded

Products and versions

2 products, 4 version entries
SourceVendorProductSchemeAffected versions
osv io.netty netty-codec-haproxy generic ＜ 4.1.136 · ≥ 4.2.0 and ＜ 4.2.16
nvd netty netty generic ＜ 4.1.136 · ≥ 4.2.0 and ＜ 4.2.16

References

URLTags
https://github.com/netty/netty/security/advisories/GHSA-wh89-7897-x99h advisory
https://github.com/netty/netty PACKAGE
https://github.com/netty/netty/releases/tag/netty-4.1.136.Final WEB
https://github.com/netty/netty/releases/tag/netty-4.2.16.Final WEB

Timeline
Published2026-07-29By the CVE Program.
NVD record modified2026-08-06NVD's own last-modified date for this record.