{"id":"CVE-2026-39835","aliases":["GHSA-78mq-xcr3-xm33","GO-2026-5015"],"url":"https://o3.security/vulnerability/CVE-2026-39835","summary":"Invoking  server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh","details":"SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.","published":"2026-05-22T02:31:26.982Z","modified":"2026-09-09T03:30:17.945562225Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.00504,"percentile":0.4127,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"golang.org/x/crypto","fixedVersion":"0.52.0"}],"fix":null,"references":[{"type":"WEB","url":"https://go.dev/cl/781660"},{"type":"WEB","url":"https://go.dev/issue/79563"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/a082jnz-LvI"},{"type":"WEB","url":"https://pkg.go.dev"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2026-5015"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39835.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26546"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26547"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36199"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36207"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36319"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36625"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36648"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36651"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36796"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36797"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37072"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37123"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37268"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37271"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37272"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37286"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37296"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37387"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37410"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:38504"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40118"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40262"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40945"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40969"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40972"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40974"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41019"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41031"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41036"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41066"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42146"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42796"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:43052"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:43692"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:46885"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:47735"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:47949"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:48151"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:51033"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:51036"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:51038"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:52857"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:52910"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:54525"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:57194"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:59467"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:59593"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60520"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:62260"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-39835"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39835.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39835"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2480680"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-09T03:30:17.945562225Z"}}