# CVE-2026-62243

## Summary

- **CVE ID:** CVE-2026-62243
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-297
- **Published:** Aug 22, 2026
- **Last Modified:** Aug 24, 2026

## Description

Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain (non-extended) X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable (Java 25+). In this configuration the OpenSSL client does not perform hostname verification, allowing a man-in-the-middle attacker to present a certificate issued for a different hostname that is accepted without validation. Fixed in 4.2.17.Final and 4.1.137.Final.

## Affected Products

- netty — netty (4.2.0.Final)
- netty — netty (4.2.16.Final)
- netty — netty (0)
- netty — netty (4.1.137.Final)

## References

- [CNA](https://github.com/netty/netty/security/advisories/GHSA-p85m-gvr3-788c)
- [CNA](https://www.vulncheck.com/advisories/netty-through-tls-hostname-verification-bypass)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.9

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._