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Vulnerabilities

Vulnerability · CVE-2026-3497

Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions.

Published Mar 12, 2026 · catalog updated Oct 15, 2026 · Red Hat ubuntu linux

Check if you run it

No confirmed exploitation is on record for CVE-2026-3497. EPSS is 1.30%. Act only if a listed version of Red Hat ubuntu linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.30%
Remediation
Advisory link
Affected products
cpe canonical/ubuntu linux · cpe debian/debian linux · cpe openbsd/openssh · cpe redhat/enterprise linux

Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe canonical/ubuntu linux20.04
  • cpe canonical/ubuntu linux22.04
  • cpe canonical/ubuntu linux24.04
  • cpe canonical/ubuntu linux25.10
  • cpe debian/debian linux11.0
  • cpe openbsd/opensshversion unspecified
  • cpe redhat/enterprise linux8.0
  • cpe redhat/enterprise linux9.0

How to fix CVE-2026-3497

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-3497. EPSS is 1.30%. Act only if a listed version of Red Hat ubuntu linux is installed.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 20.04; canonical/ubuntu linux 22.04; canonical/ubuntu linux 24.04; canonical/ubuntu linux 25.10. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-824: Access of Uninitialized Pointer; CWE-908: Use of Uninitialized Resource. EPSS 1.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 12, 2026 · NIST NVD

    Detected

    Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange t

  2. Oct 15, 2026 · NIST NVD

    Updated

    Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange t

Sources

  • CSAF AdvisoriesVendor advisoryRHSA-2026:9732:CVE-2026-3497

    A flaw was found in the OpenSSH GSSAPI (Generic Security Service Application Program Interface) delta patches, as included in various Linux distributions. A remote attacker could exploit this by sending an unexpected GSSAPI message type during the key exchange process. This occur

    security.access.redhat.com
  • CVE.orgVulnerability recordCVE-2026-3497

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3497

    30-day exploitation probability 1.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-3497

    Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.