Gnutls: gnutls: security bypass due to incorrect name constraint handling
Published May 7, 2026
7.4
HIGHCVSS 3.1
EPSS 0.57%
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.
Affected products
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||
|---|---|---|---|---|---|---|
| Red Hat | Red Hat OpenShift Container Platform 4 | affected |
|
No data.
No data.
Red Hat Discovery 2
discovery/discovery-server-rhel9:1782159791
Fixed · RHSA-2026:29197
Red Hat Discovery 2
discovery/discovery-ui-rhel9:1782166952
Fixed · RHSA-2026:29197
Red Hat Enterprise Linux 10
gnutls-0:3.8.10-4.el10_2
Fixed · RHSA-2026:20613
Red Hat Enterprise Linux 10.0 Extended Update Support
gnutls-0:3.8.9-9.el10_0.19
Fixed · RHSA-2026:26409
Red Hat Enterprise Linux 7 Extended Lifecycle Support
gnutls-0:3.3.29-9.el7_9.2
Fixed · RHSA-2026:43575
Red Hat Enterprise Linux 8
gnutls-0:3.6.16-8.el8_10.6
Fixed · RHSA-2026:20611
Red Hat Enterprise Linux 8
gnutls-0:3.6.16-8.el8_10.6
Fixed · RHSA-2026:20611
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
gnutls-0:3.6.14-10.el8_4.1
Fixed · RHSA-2026:33125
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
libtasn1-0:4.13-3.el8_4.1
Fixed · RHSA-2026:33125
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
gnutls-0:3.6.14-10.el8_4.1
Fixed · RHSA-2026:33125
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
libtasn1-0:4.13-3.el8_4.1
Fixed · RHSA-2026:33125
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
gnutls-0:3.6.16-5.el8_6.5
Fixed · RHSA-2026:30849
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
libtasn1-0:4.13-3.el8_6.2
Fixed · RHSA-2026:30849
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
gnutls-0:3.6.16-5.el8_6.5
Fixed · RHSA-2026:30849
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
libtasn1-0:4.13-3.el8_6.2
Fixed · RHSA-2026:30849
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
gnutls-0:3.6.16-7.el8_8.4
Fixed · RHSA-2026:30850
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
libtasn1-0:4.13-4.el8_8.1
Fixed · RHSA-2026:30850
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
gnutls-0:3.6.16-7.el8_8.4
Fixed · RHSA-2026:30850
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
libtasn1-0:4.13-4.el8_8.1
Fixed · RHSA-2026:30850
Red Hat Enterprise Linux 9
gnutls-0:3.8.10-4.el9_8
Fixed · RHSA-2026:20612
Red Hat Enterprise Linux 9
gnutls-0:3.8.10-4.el9_8
Fixed · RHSA-2026:20612
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
gnutls-0:3.7.6-21.el9_2.7
Fixed · RHSA-2026:41921
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
gnutls-0:3.8.3-4.el9_4.6
Fixed · RHSA-2026:32962
Red Hat Enterprise Linux 9.6 Extended Update Support
gnutls-0:3.8.3-6.el9_6.4
Fixed · RHSA-2026:30004
Red Hat Hardened Images
gnutls-main-3.8.13-1.hum1
Fixed · RHSA-2026:13274
Red Hat OpenShift Container Platform 4.12
rhcos-412.86.202608241157-0
Fixed · RHSA-2026:59831
Red Hat OpenShift Container Platform 4.16
rhcos-416.94.202608150307-0
Fixed · RHSA-2026:56853
Red Hat OpenShift Container Platform 4.17
rhcos-417.94.202608250221-0
Fixed · RHSA-2026:60019
Red Hat OpenShift Container Platform 4.18
rhcos-418.94.202608142238-0
Fixed · RHSA-2026:57483
Red Hat OpenShift Container Platform 4.19
rhcos-4.19.9.6.202607151909-0
Fixed · RHSA-2026:40762
Red Hat Update Infrastructure 5
rhui5/cds-kubernetes-tp-rhel9:1787241211
Fixed · RHSA-2026:58981
Red Hat Update Infrastructure 5
rhui5/cds-rhel9:1781525684
Fixed · RHSA-2026:26319
Red Hat Update Infrastructure 5
rhui5/haproxy-rhel9:1781525671
Fixed · RHSA-2026:26319
Red Hat Update Infrastructure 5
rhui5/installer-rhel9:1781525693
Fixed · RHSA-2026:26319
Red Hat Update Infrastructure 5
rhui5/installer-tp-rhel9:1787135742
Fixed · RHSA-2026:58981
Red Hat Update Infrastructure 5
rhui5/rhua-rhel9:1781525739
Fixed · RHSA-2026:26319
Red Hat Update Infrastructure 5
rhui5/rhua-tp-rhel9:1787241260
Fixed · RHSA-2026:58981
Red Hat Enterprise Linux 6
gnutls
Affected
Red Hat OpenShift Container Platform 4
openshift/ose-rhel-coreos-8
Affected
Red Hat OpenShift Container Platform 4
openshift4/ose-hypershift-rhel9
Under investigation
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Discovery 2 | discovery/discovery-server-rhel9:1782159791 | Fixed | RHSA-2026:29197 |
| Red Hat Discovery 2 | discovery/discovery-ui-rhel9:1782166952 | Fixed | RHSA-2026:29197 |
| Red Hat Enterprise Linux 10 | gnutls-0:3.8.10-4.el10_2 | Fixed | RHSA-2026:20613 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | gnutls-0:3.8.9-9.el10_0.19 | Fixed | RHSA-2026:26409 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | gnutls-0:3.3.29-9.el7_9.2 | Fixed | RHSA-2026:43575 |
| Red Hat Enterprise Linux 8 | gnutls-0:3.6.16-8.el8_10.6 | Fixed | RHSA-2026:20611 |
| Red Hat Enterprise Linux 8 | gnutls-0:3.6.16-8.el8_10.6 | Fixed | RHSA-2026:20611 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | gnutls-0:3.6.14-10.el8_4.1 | Fixed | RHSA-2026:33125 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | libtasn1-0:4.13-3.el8_4.1 | Fixed | RHSA-2026:33125 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | gnutls-0:3.6.14-10.el8_4.1 | Fixed | RHSA-2026:33125 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | libtasn1-0:4.13-3.el8_4.1 | Fixed | RHSA-2026:33125 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | gnutls-0:3.6.16-5.el8_6.5 | Fixed | RHSA-2026:30849 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | libtasn1-0:4.13-3.el8_6.2 | Fixed | RHSA-2026:30849 |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | gnutls-0:3.6.16-5.el8_6.5 | Fixed | RHSA-2026:30849 |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | libtasn1-0:4.13-3.el8_6.2 | Fixed | RHSA-2026:30849 |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | gnutls-0:3.6.16-7.el8_8.4 | Fixed | RHSA-2026:30850 |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | libtasn1-0:4.13-4.el8_8.1 | Fixed | RHSA-2026:30850 |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | gnutls-0:3.6.16-7.el8_8.4 | Fixed | RHSA-2026:30850 |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | libtasn1-0:4.13-4.el8_8.1 | Fixed | RHSA-2026:30850 |
| Red Hat Enterprise Linux 9 | gnutls-0:3.8.10-4.el9_8 | Fixed | RHSA-2026:20612 |
| Red Hat Enterprise Linux 9 | gnutls-0:3.8.10-4.el9_8 | Fixed | RHSA-2026:20612 |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | gnutls-0:3.7.6-21.el9_2.7 | Fixed | RHSA-2026:41921 |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | gnutls-0:3.8.3-4.el9_4.6 | Fixed | RHSA-2026:32962 |
| Red Hat Enterprise Linux 9.6 Extended Update Support | gnutls-0:3.8.3-6.el9_6.4 | Fixed | RHSA-2026:30004 |
| Red Hat Hardened Images | gnutls-main-3.8.13-1.hum1 | Fixed | RHSA-2026:13274 |
| Red Hat OpenShift Container Platform 4.12 | rhcos-412.86.202608241157-0 | Fixed | RHSA-2026:59831 |
| Red Hat OpenShift Container Platform 4.16 | rhcos-416.94.202608150307-0 | Fixed | RHSA-2026:56853 |
| Red Hat OpenShift Container Platform 4.17 | rhcos-417.94.202608250221-0 | Fixed | RHSA-2026:60019 |
| Red Hat OpenShift Container Platform 4.18 | rhcos-418.94.202608142238-0 | Fixed | RHSA-2026:57483 |
| Red Hat OpenShift Container Platform 4.19 | rhcos-4.19.9.6.202607151909-0 | Fixed | RHSA-2026:40762 |
| Red Hat Update Infrastructure 5 | rhui5/cds-kubernetes-tp-rhel9:1787241211 | Fixed | RHSA-2026:58981 |
| Red Hat Update Infrastructure 5 | rhui5/cds-rhel9:1781525684 | Fixed | RHSA-2026:26319 |
| Red Hat Update Infrastructure 5 | rhui5/haproxy-rhel9:1781525671 | Fixed | RHSA-2026:26319 |
| Red Hat Update Infrastructure 5 | rhui5/installer-rhel9:1781525693 | Fixed | RHSA-2026:26319 |
| Red Hat Update Infrastructure 5 | rhui5/installer-tp-rhel9:1787135742 | Fixed | RHSA-2026:58981 |
| Red Hat Update Infrastructure 5 | rhui5/rhua-rhel9:1781525739 | Fixed | RHSA-2026:26319 |
| Red Hat Update Infrastructure 5 | rhui5/rhua-tp-rhel9:1787241260 | Fixed | RHSA-2026:58981 |
| Red Hat Enterprise Linux 6 | gnutls | Affected | n/a |
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-8 | Affected | n/a |
| Red Hat OpenShift Container Platform 4 | openshift4/ose-hypershift-rhel9 | Under investigation | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed May 7, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.57% (0.00570) | 45.17th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.30% (0.00303) | 21.74th | v5 (v2026.06.15) |
| May 8, 2026 | 0.02% (0.00021) | 6.05th | v4 (v2025.03.14) |
References (27)
- https://access.redhat.com/errata/RHSA-2026:13274 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:20611 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:20612 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:20613 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:26319 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:26409 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:29197 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:30004 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:30849 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:30850 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:32962 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33125 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:40762 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:41921 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:43575 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:56853 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:57483 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:58981 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:59831 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:60019 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:72502 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:74674 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-42011 vdb-entryx_refsource_REDHATVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2467437 issue-trackingx_refsource_REDHATIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2026-42011
- https://www.cve.org/CVERecord?id=CVE-2026-42011
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6
Change history (0)
No recorded changes yet.