CVE-2026-42012— Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans
Affected Version Matrix 32
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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 |
|---|---|---|---|---|
| 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 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 Update Infrastructure 5 | 1781525684 ~ * | cpe:/a:redhat:rhui:5::el9 | |
| Red Hat | Red Hat Update Infrastructure 5 | 1781525671 ~ * | cpe:/a:redhat:rhui:5::el9 | |
| Red Hat | Red Hat Update Infrastructure 5 | 1781525693 ~ * | cpe:/a:redhat:rhui:5::el9 | |
| Red Hat | Red Hat Update Infrastructure 5 | 1781525739 ~ * | cpe:/a:redhat:rhui:5::el9 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 |
II. Public POCs for CVE-2026-42012
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Vendor Advisories for CVE-2026-42012 (13)
- 🔗 RHSA-2026:20613 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:32962 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:13274 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:30850 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:33125 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:43575 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:41921 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:30849 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
Other References for CVE-2026-42012 (4)
Same Patch Batch · Red Hat · 2026-05-26 · 7 CVEs total
| CVE-2026-7374 | 9.9 CRITICAL | Kubevirt: kubevirt virt-handler: privilege escalation and node compromise via symlink foll |
| CVE-2026-4480 | 9.0 CRITICAL | Samba: samba: remote code execution in printing subsystem via unescaped job description |
| CVE-2026-5260 | 8.2 HIGH | Gnutls: gnutls: information disclosure via heap overread in rsa key exchange |
| CVE-2026-42013 | 8.2 HIGH | Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name |
| CVE-2026-48864 | 7.8 HIGH | Libsolv: heap buffer overflow in libsolv repopagestore via unchecked decompression of mali |
| CVE-2026-42015 | 5.3 MEDIUM | Gnutls: gnutls: memory corruption due to off-by-one error in pkcs#12 bag handling |
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
- CVE-2026-13002
Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap - CVE-2026-58224
Samba: ctdb fails to do integrity checking of received packe - CVE-2026-19617
Libdm: lvm2: libdm: denial of service via uncontrolled recur - CVE-2026-73584
Sblim-sfcb: sblim-sfcb: privileged file corruption and denia - CVE-2026-73583
Sblim-sfcb: unsafe deserialization in sblim-sfcb provider-ma
Same vendor: Red Hat
- CVE-2026-66795
Managedcluster-import-controller: managedcluster-import-cont - CVE-2026-71472
Acm-search-v2-rhel9: search-v2-operator: shell-command and s - CVE-2026-70495
Search-v2-operator: search-v2-operator: cluster-wide imperso - CVE-2026-66792
Multicloud-operators-subscription: multicloud-operators-subs - CVE-2026-15218
Models-as-a-service: red hat openshift ai: maas-api and maas
Same weakness: CWE-295
- CVE-2026-66795
Managedcluster-import-controller: managedcluster-import-cont - CVE-2026-63650
OpenVPN 2.7.x身份认证漏洞 - CVE-2026-49457
QUIC has Broken TLS verification - CVE-2026-54481
Internal API HTTP client hardcodes InsecureSkipVerify:true w - CVE-2026-70454
rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/Open
V. Comments for CVE-2026-42012
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