{"cve":"CVE-2026-39835","nvd":{"published":"2026-05-22T04:16:24.530","modified":"2026-09-18T13:18:12.740","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-295","CWE-476"],"references":["https://go.dev/cl/781660","https://go.dev/issue/79563","https://groups.google.com/g/golang-announce/c/a082jnz-LvI","https://pkg.go.dev/vuln/GO-2026-5015","https://access.redhat.com/errata/RHSA-2026:26546"],"products":["golang:crypto"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-39835","score":0.00504,"percentile":0.43093,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-78mq-xcr3-xm33","url":"https://osv.dev/vulnerability/GHSA-78mq-xcr3-xm33","summary":"golang.org/x/crypto is vulnerable to invoking server panic during CheckHostKey/Authenticate flow","modified":"2026-09-11T15:45:36.488635295Z","packages":[{"ecosystem":"Go","name":"golang.org/x/crypto","purl":"pkg:golang/golang.org/x/crypto","ranges":["<0.52.0"],"fixed":["0.52.0"]}]},{"id":"GO-2026-5015","url":"https://osv.dev/vulnerability/GO-2026-5015","summary":"Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh","modified":"2026-09-22T10:41:48.922257369Z","packages":[{"ecosystem":"Go","name":"golang.org/x/crypto","purl":"pkg:golang/golang.org/x/crypto","ranges":["<0.52.0"],"fixed":["0.52.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}