{"cve":"CVE-2026-59919","nvd":{"published":"2026-07-29T18:16:56.610","modified":"2026-08-06T20:33:28.940","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","score":5.5},"cwes":["CWE-93"],"references":["https://github.com/netty/netty/security/advisories/GHSA-wh89-7897-x99h","https://github.com/netty/netty/security/advisories/GHSA-wh89-7897-x99h"],"products":["netty:netty"],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-59919","score":0.00165,"percentile":0.05698,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-wh89-7897-x99h","url":"https://osv.dev/vulnerability/GHSA-wh89-7897-x99h","summary":"Netty: HAProxy V1 Protocol CRLF Injection via AF_UNIX Address","modified":"2026-09-10T03:51:12.532785134Z","packages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-haproxy","purl":"pkg:maven/io.netty/netty-codec-haproxy","ranges":[">=4.2.0.Final <4.2.16.Final"],"fixed":["4.2.16.Final"]},{"ecosystem":"Maven","name":"io.netty:netty-codec-haproxy","purl":"pkg:maven/io.netty/netty-codec-haproxy","ranges":["<4.1.136.Final"],"fixed":["4.1.136.Final"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}