VulnSocial

CVE-2026-62243Disclosure

LOWCVSS 8.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-297

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-08-22); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-08-22: 1Mentions · 2026-08-23: 1Patch / Workaround · 2026-08-23: 1Technical Details · 2026-08-22: 1Technical Details · 2026-08-23: 108-2208-23
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-08-221
Disclosure1
2026-08-231
Patch1
Full discourse2 posts
  • ADK Cyber@ADKCyber
    Patch

    Netty CVE-2026-62243 (CVSS 8.7) disables TLS hostname verification in affected versions (http://4.1.x-4.2.16.Final) on OPENSSL client. Update dependencies promptly. https://nvd.nist.gov/vuln/detail/C… via NVD Recent High CVSS #CyberSecurity #InfoSec #Vulnerability #AI #MachineLearning https://t.co/Ef6cBvFexv

    Post summary

    Netty CVE‑2026‑62243 disables TLS hostname verification on OpenSSL clients, carrying a CVSS score of 8.7. Users are urged to update dependencies promptly; no PoC or active exploitation is reported.

    0000034
    93 followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-62243 Netty TLS Hostname Verification Bypass Allows Man-in-the-Middle Attacks https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-62243

    Post summary

    A Netty TLS hostname verification bypass (CVE‑2026‑62243) is disclosed, enabling man‑in‑the‑middle attacks; no PoC, exploit code, or patch details are provided.

    00000106
    4.1K followersView on X

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