Log in Start free

Vulnerability · Published Mar 12, 2026 · Assigned by canonical

CVE-2026-3497

High 8.2

In plain English

A high-severity security flaw in openssh from Ubuntu. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.3% (higher than 83% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)2.3%top 16.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10openssh9.9p1-13.el10_1.alma.1ALSA-2026:6463
AlmaLinux:8openssh8.0p1-28.el8_10ALSA-2026:6461
AlmaLinux:9openssh8.7p1-48.el9_7.alma.1ALSA-2026:6462
AlmaLinux:10openssh-askpass9.9p1-13.el10_1.alma.1ALSA-2026:6463
AlmaLinux:8openssh-askpass8.0p1-28.el8_10ALSA-2026:6461
AlmaLinux:9openssh-askpass8.7p1-48.el9_7.alma.1ALSA-2026:6462
AlmaLinux:8openssh-cavs8.0p1-28.el8_10ALSA-2026:6461
AlmaLinux:10openssh-clients9.9p1-13.el10_1.alma.1ALSA-2026:6463
AlmaLinux:8openssh-clients8.0p1-28.el8_10ALSA-2026:6461
AlmaLinux:9openssh-clients8.7p1-48.el9_7.alma.1ALSA-2026:6462
AlmaLinux:10openssh-keycat9.9p1-13.el10_1.alma.1ALSA-2026:6463
AlmaLinux:8openssh-keycat8.0p1-28.el8_10ALSA-2026:6461
AlmaLinux:9openssh-keycat8.7p1-48.el9_7.alma.1ALSA-2026:6462
AlmaLinux:10openssh-keysign9.9p1-13.el10_1.alma.1ALSA-2026:6463
AlmaLinux:8openssh-ldap8.0p1-28.el8_10ALSA-2026:6461
AlmaLinux:10openssh-server9.9p1-13.el10_1.alma.1ALSA-2026:6463
AlmaLinux:8openssh-server8.0p1-28.el8_10ALSA-2026:6461
AlmaLinux:9openssh-server8.7p1-48.el9_7.alma.1ALSA-2026:6462
AlmaLinux:8pam_ssh_agent_auth0.10.3-7.28.el8_10ALSA-2026:6461
AlmaLinux:9pam_ssh_agent_auth0.10.4-5.48.el9_7.alma.1ALSA-2026:6462
Debian:12openssh1:9.2p1-2+deb12u9DEBIAN-CVE-2026-3497
Debian:13openssh1:10.0p1-7+deb13u2DEBIAN-CVE-2026-3497
Debian:14openssh1:10.2p1-6DEBIAN-CVE-2026-3497
Rocky Linux:10openssh0:9.9p1-13.el10_1.rocky.0.1RLSA-2026:6463
Rocky Linux:8openssh0:8.0p1-28.el8_10RLSA-2026:6461
Rocky Linux:9openssh0:8.7p1-48.el9_7.rocky.0.1RLSA-2026:6462
Ubuntu:22.04:LTSopenssh1:8.9p1-3ubuntu0.14UBUNTU-CVE-2026-3497
Ubuntu:24.04:LTSopenssh1:9.6p1-3ubuntu13.15UBUNTU-CVE-2026-3497
Ubuntu:25.10openssh1:10.0p1-5ubuntu5.1UBUNTU-CVE-2026-3497
Ubuntu:22.04:LTSopenssh-ssh1no fix listedUBUNTU-CVE-2026-3497
Ubuntu:24.04:LTSopenssh-ssh1no fix listedUBUNTU-CVE-2026-3497
Ubuntu:25.10openssh-ssh1no fix listedUBUNTU-CVE-2026-3497
Ubuntu:26.04:LTSopenssh-ssh1no fix listedUBUNTU-CVE-2026-3497
Ubuntu:26.10openssh-ssh1no fix listedUBUNTU-CVE-2026-3497

Affected products (as reported)

VendorProductVersions
Ubuntu openssh 1:10.0p1-5ubuntu5 – before 1:10.0p1-5ubuntu5.11:9.6p1-3ubuntu13 – before 1:9.6p1-3ubuntu13.151:8.9p1-3 – before 1:8.9p1-3ubuntu0.14

Weakness: CWE-908, CWE-824 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References