CVE-2026-39835
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh | 0 < 0.52.0 | affected |
Weaknesses
- CWE-476: NULL Pointer Dereference
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via crafted SSH certificate
Additional References
- https://access.redhat.com/security/cve/CVE-2026-39835
- https://bugzilla.redhat.com/show_bug.cgi?id=2480680
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39835.json
- https://access.redhat.com/errata/RHSA-2026:26547
- https://access.redhat.com/errata/RHSA-2026:26546
References
- https://go.dev/issue/79563
- https://groups.google.com/g/golang-announce/c/a082jnz-LvI
- https://go.dev/cl/781660
- https://pkg.go.dev/vuln/GO-2026-5015
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