CVE-2026-34978.2HighCWE-908

CVE-2026-3497: Ubuntu openssh vulnerability

Ubuntu · openssh

Vendor fix available · Affected: Ubuntu openssh · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

2.4%probability of exploitation in the next 30 days

84th percentile

050100

Higher than 84% of scored CVEs

8.2HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Ubuntu · opensshfrom 1:10.0p1-5ubuntu5 before 1:10.0p1-5ubuntu5.1; from 1:9.6p1-3ubuntu13 before 1:9.6p1-3ubuntu13.15; from 1:8.9p1-3 before 1:8.9p1-3ubuntu0.14

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Use of Uninitialized Resource · Memory Corruption
Vendor: Ubuntu
Published: March 2026
Band: Possible (1 to 10%), March 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-3497 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

28 more references are in the CVE record.