CVE-2026-42011— Gnutls: gnutls: security bypass due to incorrect name constraint handling
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I. Basic Information for CVE-2026-42011
Vulnerability Information
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Vulnerability Title
Gnutls: gnutls: security bypass due to incorrect name constraint handling
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
GnuTLS 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GnuTLS是GnuTLS开源的一款免费的用于实现SSL、TLS和DTLS协议的安全通信库。 GnuTLS存在信任管理问题漏洞，该漏洞源于当先前证书颁发机构仅有排除名称约束时，允许的名称约束被错误忽略，可能导致远程攻击者绕过证书验证中的关键名称约束检查，导致接受无效证书，可能对受影响系统实施欺骗或中间人攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - | cpe:/o:redhat:enterprise_linux:10 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat Enterprise Linux 7 | - | cpe:/o:redhat:enterprise_linux:7 | |
| Red Hat | Red Hat Enterprise Linux 8 | - | cpe:/o:redhat:enterprise_linux:8 | |
| Red Hat | Red Hat Enterprise Linux 9 | - | cpe:/o:redhat:enterprise_linux:9 | |
| Red Hat | Red Hat Hardened Images | - | cpe:/a:redhat:hummingbird:1 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 |
II. Public POCs for CVE-2026-42011
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|---|
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- 2467437 – (CVE-2026-42011) CVE-2026-42011 gnutls: gnutls: Security bypass due to incorrect name constraint handlingissue-trackingx_refsource_REDHAT
- https://nvd.nist.gov/vuln/detail/CVE-2026-42011
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
- CVE-2026-42010
Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote - CVE-2026-34002
Xorg: xwayland: x.org x server: information disclosure or de - CVE-2026-34000
Xwayland: xorg: x.org x server: information disclosure and d - CVE-2026-2708
Libsoup: libsoup: http request smuggling via duplicate conte
Same vendor: Red Hat
- CVE-2026-42010
Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote - CVE-2026-34956
Openvswitch: open vswitch: denial of service via malformed f - CVE-2026-34002
Xorg: xwayland: x.org x server: information disclosure or de - CVE-2026-34000
Xwayland: xorg: x.org x server: information disclosure and d
Same weakness: CWE-295
V. Comments for CVE-2026-42011
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