--- id: CVE-2026-42010 title: A flaw was found in gnutls summary: >- A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a spec… severity: high cvss: 7.1 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N' cwe: - CWE-170 - CWE-626 vendor: gnu product: gnutls affected: - gnutls - hardened_images - openshift_container_platform = 4.0 - enterprise_linux = 6.0 - enterprise_linux = 7.0 - enterprise_linux = 8.0 - enterprise_linux = 9.0 - enterprise_linux = 10.0 patched: - openshift_container_platform 4.12 - openshift_container_platform 4.14 - openshift_container_platform 4.16 - openshift_container_platform 4.17 - openshift_container_platform 4.18 - openshift_container_platform 4.19 - openshift_container_platform 4.20 - openshift_container_platform 4.21 - openshift_container_platform 4.22 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_aus_v_8_6 - enterprise_linux_appstream_eus_extension_v_8_6 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_eus_v_10_0 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - enterprise_linux_baseos_aus_v_8_4 - enterprise_linux_baseos_eus_extension_v_8_4 - enterprise_linux_baseos_aus_v_8_6 - enterprise_linux_baseos_eus_extension_v_8_6 - enterprise_linux_baseos_e4s_v_8_8 - enterprise_linux_baseos_tus_v_8_8 - enterprise_linux_baseos_e4s_v_9_2 - enterprise_linux_baseos_e4s_v_9_4 - enterprise_linux_baseos_eus_v_9_6 - enterprise_linux_baseos_v_9 - ai_inference_server 3.2 - discovery 2 - hardened_images - update_infrastructure 5 published: '2026-05-07' updated: '2026-09-18' sourceUpdated: '2026-09-18T13:18:16.400' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42010' references: - url: 'https://access.redhat.com/errata/RHSA-2026:13274' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:20611' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:20612' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:20613' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:26319' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:26409' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:29197' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30004' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30849' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30850' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:32962' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:33125' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:34764' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:34788' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:34790' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:36004' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:36005' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:36006' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:40762' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:41921' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:56853' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:57483' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:58981' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:59831' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:60019' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:62409' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65839' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-42010' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467289' label: secalert@redhat.com - url: 'https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:13274' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:20611' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:20612' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:20613' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:26319' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:26409' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:29197' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:30004' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:30849' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:30850' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:32962' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:33125' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:34764' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:34788' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:34790' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36004' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36005' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36006' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:40762' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41921' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:56853' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:57483' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:58981' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:59831' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:60019' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:62409' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:65839' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-42010' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467289' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42010.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-42010' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42010' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.0105 epssPercentile: 0.62834 ssvc: exploitation: none automatable: 'no' technicalImpact: partial timestamp: '2026-05-07T13:47:12.364306Z' ingestedAt: '2026-06-26T16:43:13.637Z' --- ## Overview A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process. ## Affected - `gnutls` - `hardened_images` - `openshift_container_platform = 4.0` - `enterprise_linux = 6.0` - `enterprise_linux = 7.0` - `enterprise_linux = 8.0` - `enterprise_linux = 9.0` - `enterprise_linux = 10.0` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:59831** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:59831) - **RHSA-2026:62409** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:62409) - **RHSA-2026:56853** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:56853) - **RHSA-2026:60019** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:60019) - **RHSA-2026:57483** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:57483) - **RHSA-2026:40762** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-07-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:40762) - **RHSA-2026:34788** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-07-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:34788) - **RHSA-2026:34764** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-07-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:34764) - **RHSA-2026:34790** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-07-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:34790) - **RHSA-2026:26409** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · released 2026-06-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:26409) - **RHSA-2026:20613** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-05-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:20613) - **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42010.json) - **RHSA-2026:65839** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.13 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:65839)