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CVE-2026-42011— Gnutls: gnutls: security bypass due to incorrect name constraint handling

Quick assessment

Affected
CVE-2026-42011
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.4 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 42

VendorProduct Version RangeStatus
None None affected
Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593< * unaffected
Red Hat Red Hat Discovery 2 1782159791< * unaffected
1782166952< * unaffected
Red Hat Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2< * unaffected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19< * unaffected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:3.3.29-9.el7_9.2< * unaffected
Red Hat Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6< * unaffected
0:3.6.16-8.el8_10.6< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:3.6.14-10.el8_4.1< * unaffected
0:4.13-3.el8_4.1< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:3.6.14-10.el8_4.1< * unaffected
0:4.13-3.el8_4.1< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:3.6.16-5.el8_6.5< * unaffected
0:4.13-3.el8_6.2< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:3.6.16-5.el8_6.5< * unaffected
0:4.13-3.el8_6.2< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:3.6.16-7.el8_8.4< * unaffected
0:4.13-4.el8_8.1< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:3.6.16-7.el8_8.4< * unaffected
0:4.13-4.el8_8.1< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:3.8.10-4.el9_8< * unaffected
0:3.8.10-4.el9_8< * unaffected
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:3.7.6-21.el9_2.7< * unaffected
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:3.8.3-4.el9_4.6< * unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:3.8.3-6.el9_6.4< * unaffected
Red Hat Red Hat Hardened Images 3.8.13-1.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any unknown
any affected
Red Hat Red Hat OpenShift Container Platform 4.12 412.86.202608241157-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202608150307-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.17 417.94.202608250221-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.18 418.94.202608142238-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.19 4.19.9.6.202607151909-0< * unaffected
Red Hat Red Hat Update Infrastructure 5 1781525684< * unaffected
1781525671< * unaffected
1781525693< * unaffected
1781525739< * unaffected
1787241211< * unaffected
1787135742< * unaffected
1787241260< * unaffected

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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
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
- - 0 -
Red Hat Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:3.3.29-9.el7_9.2 ~ * cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:3.6.14-10.el8_4.1 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:4.13-3.el8_4.1 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:3.6.14-10.el8_4.1 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:4.13-3.el8_4.1 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:3.6.16-5.el8_6.5 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:4.13-3.el8_6.2 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:3.6.16-5.el8_6.5 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:4.13-3.el8_6.2 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:3.6.16-7.el8_8.4 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.13-4.el8_8.1 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:3.6.16-7.el8_8.4 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:4.13-4.el8_8.1 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:3.8.10-4.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:3.8.10-4.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:3.7.6-21.el9_2.7 ~ * cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:3.8.3-4.el9_4.6 ~ * cpe:/a:redhat:rhel_e4s:9.4::appstream
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:3.8.3-6.el9_6.4 ~ * cpe:/a:redhat:rhel_eus:9.6::appstream
Red Hat Red Hat OpenShift Container Platform 4.12 412.86.202608241157-0 ~ * cpe:/a:redhat:openshift:4.12::el8
Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202608150307-0 ~ * cpe:/a:redhat:openshift:4.16::el9
Red Hat Red Hat OpenShift Container Platform 4.17 417.94.202608250221-0 ~ * cpe:/a:redhat:openshift:4.17::el9
Red Hat Red Hat OpenShift Container Platform 4.18 418.94.202608142238-0 ~ * cpe:/a:redhat:openshift:4.18::el9
Red Hat Red Hat OpenShift Container Platform 4.19 4.19.9.6.202607151909-0 ~ * cpe:/a:redhat:openshift:4.19::el9
Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593 ~ * cpe:/a:redhat:cert_manager:1.20::el9
Red Hat Red Hat Discovery 2 1782159791 ~ * cpe:/a:redhat:discovery:2::el9

II. Public POCs for CVE-2026-42011

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-42011

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Vendor Advisories for CVE-2026-42011 (21)

Other References for CVE-2026-42011 (4)

IV. Related Vulnerabilities

Same weakness: CWE-295

V. Comments for CVE-2026-42011

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