VulnSocial

CVE-2026-63374Patch

LOWCVSS 9.3 · CRITICAL

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

AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, connect_tcp() and TLSStream.wrap() can validate internationalized host names after the standard library converts them with IDNA 2003 instead of IDNA 2008. When a connection to a non-ASCII domain is hijacked or redirected, an attacker can obtain a legitimate certificate for the different ASCII hostname produced by IDNA 2003 and present it to the client, causing the malicious endpoint's certificate to validate. This issue is fixed in version 4.14.2.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-295CWE-297

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 2 signals
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • Peaked 2d ago at 1 mentions (2026-09-20); latest day: 1
  • 3 total mentions across 3 days

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-09-20: 1Mentions · 2026-10-03: 1Mentions · 2026-10-23: 1Patch / Workaround · 2026-09-20: 1Patch / Workaround · 2026-10-03: 1Technical Details · 2026-09-20: 109-2010-0310-23
Signal classification2 categories
Patch
266.7%
Disclosure
133.3%
Referenced assets1 URL
By indicator
Classification over time
DateTotalLabels
2026-09-201
Patch1
2026-10-031
Patch1
2026-10-231
Disclosure1
Full discourse3 posts
  • Upwind Security MDR@UpwindMDR
    Patch

    🚨Critical - AnyIO TLS IDNA Hostname Validation Bypass (CVE-2026-63374) AnyIO mishandles internationalized (non-ASCII) domain names in TLS connections via connect_tcp() and TLSStream.wrap(). If an attacker hijacks/redirects traffic, they can present a cert for the IDNA 2003-encoded hostname that still validates, enabling TLS certificate spoofing against clients. ASCII-only hostnames are not affected. 👉Affected: anyio < 4.14.2 | Upgrade to 4.14.2

    Post summary

    The post identifies CVE-2026-63374 as a TLS hostname validation bypass in AnyIO and prescribes upgrading to version 4.14.2 as a fix. It includes technical details about the vulnerability's scope and affected features but does not mention PoC, exploits, or active exploitation.

    10010113
    307 followersView on X
  • VulniPulse@vulnipulse
    Disclosure

    CVE advisory: CVE-2026-63374 - netapp: CVE-2026-63374 AnyIO Vulnerability in NetApp Products. https://vulnipulse.com/advisories/netapp-ntap-20261014-0001 #CVE #CyberSecurity #NetApp #AnyIO

    Post summary

    The tweet announces CVE-2026-63374 as a NetApp AnyIO vulnerability and links to a full advisory page, functioning as a vulnerability disclosure with no additional indicators such as PoC, exploit, patch, or active exploitation.

    1000025
    34 followersView on X
  • MCP Scores@MCPScores
    Patch

    🚨 Critical vulnerability com.cyberspf/mcp Newly listed carrying an unpatched critical vulnerability (CVE-2026-63374). A fixed version is available.

    Post summary

    The message reports a critical vulnerability (CVE-2026-63374) and notes that a fixed version is available.

    1000041
    4 followersView on X

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