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SRC: CVELISTV5 / SYNC: T-5M / LAG: 12M / REC: 386,693 / REV: C6-1C / V4

01 RecordSTATE: PUBLISHED

CVE-2026-42013

Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

HighPUBLISHEDCNA: redhat

CNA base score8.2 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

02 Description

CNA: redhat

Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

03 Exploitation and scoring

SRC: CISA, FIRST, NVD, RED HAT

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.42% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 35.1% of scored records. A rank, not a probability.

NVD base score

8.2 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-03.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

SCHEMA: 5.2

Published

2026-05-26 21:29Z3 MO AGO

Last updated

2026-09-03 14:25Z1 DAY AGO

Reserved

2026-04-23

Assigning CNA

redhat

Record state

PUBLISHED

Severity

High (CVSS 8.2)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Weaknesses

CWE-295Improper Certificate ValidationBase

Data version

5.2

Document digest

ed6cef76e9e5d7d97834a1271cf29e232f95f53ef0c60ce509680ffd71065559

05 Affected products

PAIRS: 24

VendorProductVersionsPlatforms

Red HatRed Hat Enterprise Linux 10Not specified—

Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportNot specified—

Red HatRed Hat Enterprise Linux 7 Extended Lifecycle SupportNot specified—

Red HatRed Hat Enterprise Linux 8Not specified—

Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportNot specified—

Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnNot specified—

Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportNot specified—

Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnNot specified—

Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceNot specified—

Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 9Not specified—

Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportNot specified—

Red HatRed Hat OpenShift Container Platform 4.12Not specified—

Red HatRed Hat OpenShift Container Platform 4.16Not specified—

Red HatRed Hat OpenShift Container Platform 4.17Not specified—

Red HatRed Hat OpenShift Container Platform 4.18Not specified—

Red HatRed Hat OpenShift Container Platform 4.19Not specified—

Red HatRed Hat Discovery 2Not specified—

Red HatRed Hat Hardened ImagesNot specified—

Red HatRed Hat Update Infrastructure 5Not specified—

Red HatRed Hat Enterprise Linux 6Not specified—

Red HatRed Hat OpenShift Container Platform 4Not specified—

06 References

REFS: 23

access.redhat.comRHSA-2026:13274https://access.redhat.com/errata/RHSA-2026:13274vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20611https://access.redhat.com/errata/RHSA-2026:20611vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20612https://access.redhat.com/errata/RHSA-2026:20612vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:20613https://access.redhat.com/errata/RHSA-2026:20613vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:26319https://access.redhat.com/errata/RHSA-2026:26319vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:26409https://access.redhat.com/errata/RHSA-2026:26409vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:29197https://access.redhat.com/errata/RHSA-2026:29197vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:30004https://access.redhat.com/errata/RHSA-2026:30004vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:30849https://access.redhat.com/errata/RHSA-2026:30849vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:30850https://access.redhat.com/errata/RHSA-2026:30850vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:32962https://access.redhat.com/errata/RHSA-2026:32962vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:33125https://access.redhat.com/errata/RHSA-2026:33125vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:40762https://access.redhat.com/errata/RHSA-2026:40762vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:41921https://access.redhat.com/errata/RHSA-2026:41921vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:43575https://access.redhat.com/errata/RHSA-2026:43575vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:56853https://access.redhat.com/errata/RHSA-2026:56853vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:57483https://access.redhat.com/errata/RHSA-2026:57483vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:58981https://access.redhat.com/errata/RHSA-2026:58981vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:59831https://access.redhat.com/errata/RHSA-2026:59831vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:60019https://access.redhat.com/errata/RHSA-2026:60019vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-42013vdb-entryx_refsource_REDHAT
bugzilla.redhat.comRHBZ#2467448https://bugzilla.redhat.com/show_bug.cgi?id=2467448issue-trackingx_refsource_REDHAT
www.gnutls.orghttps://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8