Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV L L L N U N H N 5.5 .0011 1.6 —
AFFECTED Product Versions Fixed netty < 4.1.136.Final – —
TIMELINE Jul 7 Reserved by GitHub_M Jul 29 EXPLOIT PUBLISHED — CVE-2026-59919 (netty). Public exploit reference added. Jul 29 Published (CNA: GitHub_M)
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.
| Date | Event | Detail |
|---|---|---|
| July 7, 2026 | Reserved | Reserved by GitHub_M |
| July 29, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-59919 (netty). Public exploit reference added. |
| July 29, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| netty | netty | — | < 4.1.136.Final | — |
Authoritative record: CVE-2026-59919 at cve.org
Vendors: netty
Weaknesses: CWE-93
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-59919 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.