Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh

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Summary

CVECVE-2026-39835
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-22 04:16:24 UTC
Updated2026-05-28 14:56:13 UTC
DescriptionSSH 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS: 0.000190000 probability, percentile 0.055540000 (date 2026-05-27)

Problem Types: CWE-295 | CWE-476: NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Crypto All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Golang.orgxcrypto Golang.org/x/crypto/ssh affected 0.52.0 semver Not specified

References

ReferenceSourceLinkTags
groups.google.com/g/golang-announce/c/a082jnz-LvI [email protected] groups.google.com Mailing List
go.dev/cl/781660 [email protected] go.dev Issue Tracking
go.dev/issue/79563 [email protected] go.dev Issue Tracking
pkg.go.dev/vuln/GO-2026-5015 [email protected] pkg.go.dev Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: NCC Group Cryptography Services, sponsored by Teleport (en)

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