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google-guest-agent vulnerabilities

Vulnerabilities published for google-guest-agent in the last 30 days: 0. Listed in the KEV catalogue: 0.

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Vulnerabilities: 14

  1. CVE-2026-46595

    Critical · CVSS 10EPSS 0.56%Fix available

    Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh

    Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of callback is passed other than public key, then the source-address validation would be skipped.

    • Update to 20250506.01-0ubuntu1.2
    Published Updated
  2. CVE-2026-39834

    Critical · CVSS 9.1EPSS 0.6%Fix available

    Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh

    When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.

    • Update to 20250506.01-0ubuntu1.2
    Published Updated
  3. CVE-2026-39831

    Critical · CVSS 9.1EPSS 0.48%Fix available

    Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh

    The Verify() method for FIDO/U2F security key types ([email protected], [email protected]) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.

    • Update to 20250506.01-0ubuntu1.2
    Published Updated
  4. CVE-2026-39829

    High · CVSS 7.5EPSS 0.47%No fix published

    Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh

    The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.

    Published Updated
  5. CVE-2026-39830

    Critical · CVSS 9.1EPSS 0.68%Fix available

    Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

    A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

    • Update to 20250506.01-0ubuntu1.2
    Published Updated
  6. CVE-2026-39827

    Medium · CVSS 6.5EPSS 0.28%No fix published

    Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh

    An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

    Published Updated
  7. CVE-2026-39835

    Medium · CVSS 5.3EPSS 0.5%No fix published

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

    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 Updated
  8. CVE-2026-39828

    Medium · CVSS 6.3EPSS 0.37%No fix published

    Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

    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 Updated
  9. CVE-2026-33186

    Critical · CVSS 9.1EPSS 1.58%No fix published

    gRPC-Go has an authorization bypass via missing leading slash in :path

    gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, "deny" rules defined using canonical paths (starting with `/`) failed to

    Published Updated

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