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CVE Vulnerability Details :
CVE-2026-42013
PUBLISHED
More InfoOfficial Page
Assigner-redhat
Assigner Org ID-53f830b8-0a3f-465b-8143-3b8a9948e749
View Known Exploited Vulnerability (KEV) details
Published At-26 May, 2026 | 21:29
Updated At-24 Jun, 2026 | 16:34
Rejected At-
▼CVE Numbering Authority (CNA)
Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

Affected Products
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 10
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/o:redhat:enterprise_linux:10.2
Default Status
affected
Versions
Unaffected
  • From 0:3.8.10-4.el10_2 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 10.0 Extended Update Support
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/o:redhat:enterprise_linux_eus:10.0
Default Status
affected
Versions
Unaffected
  • From 0:3.8.9-9.el10_0.19 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 8
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/a:redhat:enterprise_linux:8::appstream
  • cpe:/o:redhat:enterprise_linux:8::baseos
Default Status
affected
Versions
Unaffected
  • From 0:3.6.16-8.el8_10.6 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 8
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/a:redhat:enterprise_linux:8::appstream
  • cpe:/o:redhat:enterprise_linux:8::baseos
Default Status
affected
Versions
Unaffected
  • From 0:3.6.16-8.el8_10.6 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 9
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/a:redhat:enterprise_linux:9::appstream
  • cpe:/o:redhat:enterprise_linux:9::baseos
Default Status
affected
Versions
Unaffected
  • From 0:3.8.10-4.el9_8 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 9
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/a:redhat:enterprise_linux:9::appstream
  • cpe:/o:redhat:enterprise_linux:9::baseos
Default Status
affected
Versions
Unaffected
  • From 0:3.8.10-4.el9_8 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Discovery 2
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
discovery/discovery-server-rhel9
CPEs
  • cpe:/a:redhat:discovery:2::el9
Default Status
affected
Versions
Unaffected
  • From 1782159791 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Discovery 2
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
discovery/discovery-ui-rhel9
CPEs
  • cpe:/a:redhat:discovery:2::el9
Default Status
affected
Versions
Unaffected
  • From 1782166952 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Update Infrastructure 5
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhui5/cds-rhel9
CPEs
  • cpe:/a:redhat:rhui:5::el9
Default Status
affected
Versions
Unaffected
  • From 1781525684 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Update Infrastructure 5
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhui5/haproxy-rhel9
CPEs
  • cpe:/a:redhat:rhui:5::el9
Default Status
affected
Versions
Unaffected
  • From 1781525671 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Update Infrastructure 5
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhui5/installer-rhel9
CPEs
  • cpe:/a:redhat:rhui:5::el9
Default Status
affected
Versions
Unaffected
  • From 1781525693 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Update Infrastructure 5
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhui5/rhua-rhel9
CPEs
  • cpe:/a:redhat:rhui:5::el9
Default Status
affected
Versions
Unaffected
  • From 1781525739 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 6
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/o:redhat:enterprise_linux:6
Default Status
unknown
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 7
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/o:redhat:enterprise_linux:7
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Hardened Images
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
gnutls
CPEs
  • cpe:/a:redhat:hummingbird:1
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat OpenShift Container Platform 4
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
rhcos
CPEs
  • cpe:/a:redhat:openshift:4
Default Status
affected
Problem Types
TypeCWE IDDescription
CWECWE-1284Improper Validation of Specified Quantity in Input
Type: CWE
CWE ID: CWE-1284
Description: Improper Validation of Specified Quantity in Input
Metrics
VersionBase scoreBase severityVector
3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Metrics Other Info
Red Hat severity rating
value:
Moderate
namespace:
https://access.redhat.com/security/updates/classification/
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Red Hat would like to thank Haruto Kimura (Stella) and Joshua Rogers (AISLE Research Team) for reporting this issue.
Timeline
EventDate
Reported to Red Hat.2026-05-06 19:47:00
Made public.2026-04-29 00:00:00
Event: Reported to Red Hat.
Date: 2026-05-06 19:47:00
Event: Made public.
Date: 2026-04-29 00:00:00
Replaced By

Rejected Reason

References
HyperlinkResource
https://access.redhat.com/errata/RHSA-2026:20611
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20612
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20613
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26319
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26409
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29197
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-42013
vdb-entry
x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2467448
issue-tracking
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:20611
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:20612
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:20613
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:26319
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:26409
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:29197
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/security/cve/CVE-2026-42013
Resource:
vdb-entry
x_refsource_REDHAT
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2467448
Resource:
issue-tracking
x_refsource_REDHAT
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Details not found