{"id":"CVE-2026-42010","summary":"Gnutls: gnutls: authentication bypass via nul character in username","details":"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.","modified":"2026-10-02T11:46:00.812394919Z","published":"2026-05-07T12:00:05.433Z","related":["ALSA-2026:20611","ALSA-2026:20612","ALSA-2026:20613","SUSE-SU-2026:2087-1","SUSE-SU-2026:2115-1","SUSE-SU-2026:21752-1","SUSE-SU-2026:21784-1","SUSE-SU-2026:21815-1","SUSE-SU-2026:21867-1","SUSE-SU-2026:2822-1","openSUSE-SU-2026:10691-1","openSUSE-SU-2026:20778-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42010.json","cna_assigner":"redhat","cwe_ids":["CWE-170"]},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://catalog.redhat.com/software/containers/"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42010.json"},{"type":"WEB","url":"https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13274"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20611"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20612"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20613"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26319"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26409"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:29197"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30004"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30849"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30850"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:32962"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33125"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34764"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34788"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34790"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36004"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36005"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36006"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40762"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41921"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:56853"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:57483"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:58981"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:59831"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60019"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:62409"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:65839"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:67857"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:72502"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:74674"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42010"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42010.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42010"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2467289"},{"type":"PACKAGE","url":"https://gitlab.com/gnutls/gnutls"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.com/gnutls/gnutls","events":[{"introduced":"0"},{"last_affected":"0"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0"}],"source":"AFFECTED_FIELD"}}],"versions":["0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-42010.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"}]}