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CVE-2026-42012— Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

Quick assessment

Affected
CVE-2026-42012
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，该漏洞源于证书验证过程中，特制证书可能导致错误回退到检查通用名称字段，可能允许攻击者伪造合法服务或拦截敏感信息。

CVSS 7.1 · High EPSS 0.49% · P40

Affected Version Matrix 39

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 affected
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 AI 3.4 1790703542< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any unknown
any affected
any affected
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-2026-42012

Vulnerability Information
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Vulnerability Title
Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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，该漏洞源于证书验证过程中，特制证书可能导致错误回退到检查通用名称字段，可能允许攻击者伪造合法服务或拦截敏感信息。
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 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
Red Hat Red Hat Discovery 2 1782166952 ~ * cpe:/a:redhat:discovery:2::el9
Red Hat Red Hat Hardened Images 3.8.13-1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat OpenShift AI 3.4 1790703542 ~ * cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat Red Hat Update Infrastructure 5 1781525684 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1781525671 ~ * cpe:/a:redhat:rhui:5::el9

II. Public POCs for CVE-2026-42012

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-42012

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Vendor Advisories for CVE-2026-42012 (16)

Other References for CVE-2026-42012 (4)

IV. Related Vulnerabilities

Same weakness: CWE-295

V. Comments for CVE-2026-42012

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