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CVE-2026-3833— Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison

CVSS 6.5 · Medium EPSS 0.56% · P44

Affected Version Matrix 33

VendorProductVersion RangeStatus
NoneNone< 3.8.13affected
Red HatRed Hat Discovery 21782159791< *unaffected
1782166952< *unaffected
Red HatRed Hat Enterprise Linux 100:3.8.10-4.el10_2< *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:3.8.9-9.el10_0.19< *unaffected
Red HatRed Hat Enterprise Linux 6anyaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support0:3.3.29-9.el7_9.2< *unaffected
Red HatRed Hat Enterprise Linux 80:3.6.16-8.el8_10.6< *unaffected
0:3.6.16-8.el8_10.6< *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:3.6.14-10.el8_4.1< *unaffected
0:4.13-3.el8_4.1< *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:3.6.14-10.el8_4.1< *unaffected
0:4.13-3.el8_4.1< *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:3.6.16-5.el8_6.5< *unaffected
0:4.13-3.el8_6.2< *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:3.6.16-5.el8_6.5< *unaffected
0:4.13-3.el8_6.2< *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:3.6.16-7.el8_8.4< *unaffected
0:4.13-4.el8_8.1< *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:3.6.16-7.el8_8.4< *unaffected
0:4.13-4.el8_8.1< *unaffected
Red HatRed Hat Enterprise Linux 90:3.8.10-4.el9_8< *unaffected
0:3.8.10-4.el9_8< *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:3.7.6-21.el9_2.7< *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:3.8.3-4.el9_4.6< *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:3.8.3-6.el9_6.4< *unaffected
Red HatRed Hat Hardened Images3.8.13-1.hum1< *unaffected
Red HatRed Hat OpenShift Container Platform 4anyunknown
anyaffected
Red HatRed Hat Update Infrastructure 51781525684< *unaffected
1781525671< *unaffected
1781525693< *unaffected
1781525739< *unaffected

I. Basic Information for CVE-2026-3833

Vulnerability Information
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Vulnerability Title
Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Enterprise Linux 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Enterprise Linux是美国红帽（Red Hat）公司的面向企业用户的Linux操作系统。 Red Hat Enterprise Linux 10存在安全漏洞，该漏洞源于对nameConstraints标签进行大小写敏感比较，可能导致远程攻击者通过构造大小写差异的SAN证书绕过策略限制。
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

VendorProductAffected VersionsCPESubscribe
-- 0 ~ 3.8.13 -
Red HatRed Hat Enterprise Linux 10 0:3.8.10-4.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red HatRed 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 HatRed Hat Enterprise Linux 7 Extended Lifecycle Support 0:3.3.29-9.el7_9.2 ~ * cpe:/o:redhat:rhel_els:7
Red HatRed Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed 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 HatRed 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 HatRed 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 HatRed 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 HatRed 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 HatRed 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 HatRed 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 HatRed 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 HatRed 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 HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.13-4.el8_8.1 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red HatRed 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 HatRed 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 HatRed Hat Enterprise Linux 9 0:3.8.10-4.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red HatRed Hat Enterprise Linux 9 0:3.8.10-4.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red HatRed 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 HatRed 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 HatRed 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 HatRed Hat Discovery 2 1782159791 ~ * cpe:/a:redhat:discovery:2::el9
Red HatRed Hat Discovery 2 1782166952 ~ * cpe:/a:redhat:discovery:2::el9
Red HatRed Hat Hardened Images 3.8.13-1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red HatRed Hat Update Infrastructure 5 1781525684 ~ * cpe:/a:redhat:rhui:5::el9
Red HatRed Hat Update Infrastructure 5 1781525671 ~ * cpe:/a:redhat:rhui:5::el9
Red HatRed Hat Update Infrastructure 5 1781525693 ~ * cpe:/a:redhat:rhui:5::el9
Red HatRed Hat Update Infrastructure 5 1781525739 ~ * cpe:/a:redhat:rhui:5::el9
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat OpenShift Container Platform 4-cpe:/a:redhat:openshift:4
Red HatRed Hat OpenShift Container Platform 4-cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-3833

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III. Intelligence Information for CVE-2026-3833

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Vendor Advisories for CVE-2026-3833 (12)

Other References for CVE-2026-3833 (4)

IV. Related Vulnerabilities

Same weakness: CWE-178

V. Comments for CVE-2026-3833

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