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CVE-2026-42013— Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

CVSS 8.2 · High EPSS 0.03% · P10

Affected Version Matrix 8

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 10anyaffected
Red HatRed Hat Enterprise Linux 6anyunknown
Red HatRed Hat Enterprise Linux 7anyaffected
Red HatRed Hat Enterprise Linux 80:3.6.16-8.el8_10.6< *unaffected
0:3.6.16-8.el8_10.6< *unaffected
Red HatRed Hat Enterprise Linux 9anyaffected
Red HatRed Hat Hardened Imagesanyaffected
Red HatRed Hat OpenShift Container Platform 4anyaffected
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I. Basic Information for CVE-2026-42013

Vulnerability Information
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Vulnerability Title
Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1284
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Enterprise Linux 10-cpe:/o:redhat:enterprise_linux:10
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat Enterprise Linux 7-cpe:/o:redhat:enterprise_linux:7
Red HatRed Hat Enterprise Linux 9-cpe:/o:redhat:enterprise_linux:9
Red HatRed Hat Hardened Images-cpe:/a:redhat:hummingbird:1
Red HatRed Hat OpenShift Container Platform 4-cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-42013

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III. Intelligence Information for CVE-2026-42013

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Vendor Advisories for CVE-2026-42013 (2)

Other References for CVE-2026-42013 (1)

Same Patch Batch · Red Hat · 2026-05-26 · 7 CVEs total

CVE-2026-73749.9 CRITICALKubevirt: kubevirt virt-handler: privilege escalation and node compromise via symlink foll
CVE-2026-44808.5 HIGHSamba: samba: remote code execution in printing subsystem via unescaped job description
CVE-2026-52608.2 HIGHGnutls: gnutls: information disclosure via heap overread in rsa key exchange
CVE-2026-488647.8 HIGHLibsolv: heap buffer overflow in libsolv repopagestore via unchecked decompression of mali
CVE-2026-420127.1 HIGHGnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans
CVE-2026-420155.3 MEDIUMGnutls: gnutls: memory corruption due to off-by-one error in pkcs#12 bag handling

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-1284

V. Comments for CVE-2026-42013

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