CVE Feed

    Dashboard / CVE / CVE-2026-39828

    CVE-2026-39828

    When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

    Published:May 22, 2026
    Last Modified:Aug 28, 2026
    EPS:May 22, 2026
    EPSS Score:0.00369
    CVSS Score:6.3

    Affected Products

    Vendor
    Golang
    Product
    Crypto
    Vendor
    Golang
    Product
    Ssh

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-19 Embedding Scripts within Scripts
    CAPEC-441 Malicious Logic Insertion
    CAPEC-459 Creating a Rogue Certification Authority Certificate
    CAPEC-475 Signature Spoofing by Improper Validation
    CAPEC-478 Modification of Windows Service Configuration
    CAPEC-479 Malicious Root Certificate
    CAPEC-502 Intent Spoof
    CAPEC-503 WebView Exposure
    CAPEC-536 Data Injected During Configuration
    CAPEC-546 Incomplete Data Deletion in a Multi-Tenant Environment
    CAPEC-550 Install New Service
    CAPEC-551 Modify Existing Service
    CAPEC-552 Install Rootkit
    CAPEC-556 Replace File Extension Handlers
    CAPEC-558 Replace Trusted Executable
    CAPEC-562 Modify Shared File
    CAPEC-563 Add Malicious File to Shared Webroot
    CAPEC-564 Run Software at Logon
    CAPEC-578 Disable Security Software

    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/781621
    https://go.dev/issue/79562
    https://groups.google.com/g/golang-announce/c/a082jnz-LvI
    https://pkg.go.dev/vuln/GO-2026-5014
    https://access.redhat.com/errata/RHSA-2026:26546
    https://access.redhat.com/errata/RHSA-2026:26547
    https://access.redhat.com/errata/RHSA-2026:36105
    https://access.redhat.com/errata/RHSA-2026:36167
    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-2026:36808
    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-2026:37278
    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-2026:40118
    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-2026:41055
    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-2026:46903
    https://access.redhat.com/errata/RHSA-2026:47735
    https://access.redhat.com/errata/RHSA-2026:48151
    https://access.redhat.com/errata/RHSA-2026:51033
    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-2026:54531
    https://access.redhat.com/errata/RHSA-2026:57191
    https://access.redhat.com/errata/RHSA-2026:57194
    https://access.redhat.com/errata/RHSA-2026:59467
    https://access.redhat.com/errata/RHSA-2026:60520
    https://access.redhat.com/security/cve/CVE-2026-39828
    https://bugzilla.redhat.com/show_bug.cgi?id=2480687
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39828.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