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    CVE-2026-39835

    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:May 22, 2026
    Last Modified:Sep 2, 2026
    EPS:May 22, 2026
    EPSS Score:0.00504
    CVSS Score:5.3

    Affected Products

    Vendor
    Golang
    Product
    Crypto
    Vendor
    Golang
    Product
    Ssh

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-56855 (CVSS 7.5) — Previously, after a channel has been established, a malicious peer could send crafted messages that would dead…
    CVE-2026-78662 (CVSS 7.5) — Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer…
    CVE-2026-56854 (CVSS 7.5) — The source-address critical option in the Permissions returned by an authentication callback was only enforced…
    CVE-2026-46598 (CVSS 5.3) — For certain crafted inputs, a 'ed25519.PrivateKey' was created by casting malformed wire bytes, leading to a p…
    CVE-2026-46595 (CVSS 10) — Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other t…
    CVE-2026-42508 (CVSS 9.1) — Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the…
    CVE-2026-39834 (CVSS 9.1) — When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the interna…
    CVE-2026-39831 (CVSS 9.1) — The Verify() method for FIDO/U2F security key types ([email protected], sk-ssh-ed25519@openss…
    CVE-2026-39829 (CVSS 7.5) — The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an…
    CVE-2026-39830 (CVSS 9.1) — A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the …

    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
    https://access.redhat.com/errata/RHSA-2026:26547
    https://access.redhat.com/errata/RHSA-2026:36199
    https://access.redhat.com/errata/RHSA-2026:36207
    https://access.redhat.com/errata/RHSA-2026:36319
    https://access.redhat.com/errata/RHSA-2026:36625
    https://access.redhat.com/errata/RHSA-2026:36648
    https://access.redhat.com/errata/RHSA-2026:36651
    https://access.redhat.com/errata/RHSA-2026:36796
    https://access.redhat.com/errata/RHSA-2026:36797
    https://access.redhat.com/errata/RHSA-2026:37072
    https://access.redhat.com/errata/RHSA-2026:37123
    https://access.redhat.com/errata/RHSA-2026:37268
    https://access.redhat.com/errata/RHSA-2026:37271
    https://access.redhat.com/errata/RHSA-2026:37272
    https://access.redhat.com/errata/RHSA-2026:37286
    https://access.redhat.com/errata/RHSA-2026:37296
    https://access.redhat.com/errata/RHSA-2026:37387
    https://access.redhat.com/errata/RHSA-2026:37410
    https://access.redhat.com/errata/RHSA-2026:38504
    https://access.redhat.com/errata/RHSA-2026:40118
    https://access.redhat.com/errata/RHSA-2026:40262
    https://access.redhat.com/errata/RHSA-2026:40945
    https://access.redhat.com/errata/RHSA-2026:40969
    https://access.redhat.com/errata/RHSA-2026:40972
    https://access.redhat.com/errata/RHSA-2026:40974
    https://access.redhat.com/errata/RHSA-2026:41019
    https://access.redhat.com/errata/RHSA-2026:41031
    https://access.redhat.com/errata/RHSA-2026:41036
    https://access.redhat.com/errata/RHSA-2026:41066
    https://access.redhat.com/errata/RHSA-2026:42146
    https://access.redhat.com/errata/RHSA-2026:42796
    https://access.redhat.com/errata/RHSA-2026:43052
    https://access.redhat.com/errata/RHSA-2026:43692
    https://access.redhat.com/errata/RHSA-2026:46885
    https://access.redhat.com/errata/RHSA-2026:47735
    https://access.redhat.com/errata/RHSA-2026:47949
    https://access.redhat.com/errata/RHSA-2026:48151
    https://access.redhat.com/errata/RHSA-2026:51033
    https://access.redhat.com/errata/RHSA-2026:51036
    https://access.redhat.com/errata/RHSA-2026:51038
    https://access.redhat.com/errata/RHSA-2026:52857
    https://access.redhat.com/errata/RHSA-2026:52910
    https://access.redhat.com/errata/RHSA-2026:54525
    https://access.redhat.com/errata/RHSA-2026:57194
    https://access.redhat.com/errata/RHSA-2026:59467
    https://access.redhat.com/errata/RHSA-2026:59593
    https://access.redhat.com/errata/RHSA-2026:60520
    https://access.redhat.com/errata/RHSA-2026:62260
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High