Status: UPDATED | Advisory ID: CVE-2026-42013
| CVE | CVE-2026-42013 |
| CVSS Score / Version | 8.2 (High) / CVSS v3.1 |
| Updated | 2026-10-02 |
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |
| CVSS Prose | attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is low; integrity impact is high; availability impact is none. |
| Affected products | see table below |
| Classified as | CWE-295 (Improper Certificate Validation) |
| Vendor | Product | Affected Versions | Patch Status |
|---|---|---|---|
| Red Hat | Red Hat OpenShift AI 3.4 | ||
| Red Hat | Red Hat Enterprise Linux 10 | ||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | ||
| Red Hat | Red Hat Enterprise Linux 8 | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | ||
| Red Hat | Red Hat Enterprise Linux 9 | ||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | ||
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | ||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | ||
| Red Hat | Red Hat Update Infrastructure 5 | ||
| Red Hat | Red Hat Hardened Images | ||
| Red Hat | Red Hat OpenShift Container Platform 4.12 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.16 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.17 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.18 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.19 | ||
| Red Hat | Red Hat OpenShift Container Platform 4 | ||
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | ||
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.20 | ||
| Red Hat | Red Hat Discovery 2 |
| Subsystems | General OT |
| Sectors | Multiple |
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. (NVD)
Monitor Red Hat's web page for any future patch releases.
| Source | Reference |
|---|---|
| NVD | https://nvd.nist.gov/vuln/detail/CVE-2026-42013 |
| CVE | https://www.cve.org/CVERecord?id=CVE-2026-42013 |