CVE-2026-3497
published 2026-03-12CVE-2026-3497: Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux…
PriorityP349high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
2.18%
80.5th percentile
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
19 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | debian_linux | — | — |
| debian | openssh | < openssh 1:9.2p1-2+deb12u9 (bookworm) | openssh 1:9.2p1-2+deb12u9 (bookworm) |
| openbsd | openssh | >= 0 < 1:9.2p1-2+deb12u9 | 1:9.2p1-2+deb12u9 |
| openbsd | openssh | >= 0 < 1:10.0p1-7+deb13u2 | 1:10.0p1-7+deb13u2 |
| openbsd | openssh | >= 0 < 1:10.2p1-6 | 1:10.2p1-6 |
| openbsd | openssh | >= 0 < 1:8.9p1-3ubuntu0.14 | 1:8.9p1-3ubuntu0.14 |
| openbsd | openssh | >= 0 < 1:9.6p1-3ubuntu13.15 | 1:9.6p1-3ubuntu13.15 |
| openbsd | openssh | >= 0 < 1:10.0p1-5ubuntu5.1 | 1:10.0p1-5ubuntu5.1 |
| openbsd | openssh | >= 0 < 1:8.2p1-4ubuntu0.13+esm1 | 1:8.2p1-4ubuntu0.13+esm1 |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| ubuntu | openssh | >= 1:10.0p1-5ubuntu5 < 1:10.0p1-5ubuntu5.1 | 1:10.0p1-5ubuntu5.1 |
| ubuntu | openssh | >= 1:8.9p1-3 < 1:8.9p1-3ubuntu0.14 | 1:8.9p1-3ubuntu0.14 |
| ubuntu | openssh | >= 1:9.6p1-3ubuntu13 < 1:9.6p1-3ubuntu13.15 | 1:9.6p1-3ubuntu13.15 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.06.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
osv6.9MEDIUM
vendor_debian6.9MEDIUM
vendor_redhat6.9MEDIUM
vendor_ubuntu3.6LOW
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Red Hat
openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables
vendor_redhat·2026-03-12·CVSS 6.9
CVE-2026-3497 [MEDIUM] CWE-824 openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables
openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables
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 undefine
Ubuntu
OpenSSH vulnerabilities
vendor_ubuntu·2026-03-12·CVSS 3.6
CVE-2025-61984 [LOW] OpenSSH vulnerabilities
Title: OpenSSH vulnerabilities
Summary: Several security issues were fixed in OpenSSH.
Jeremy Brown discovered that the OpenSSH GSSAPI Key Exchange incorrectly
handled disconnecting clients. In non-default configurations where the
GSSAPIKeyExchange setting is enabled, a remote attacker could use this
issue to cause OpenSSH to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2026-3497)
David Leadbeater discovered that OpenSSH incorrectly handled certain
control characters in usernames. When untrusted usernames and the
ProxyCommand are being used, an attacker could possibly use this issue to
execute arbitrary code. (CVE-2025-61984)
David Leadbeater discovered that OpenSSH incorrectly handled NULL
characters in ssh:// URIs. When the ProxyCommand is being u
Ubuntu
OpenSSH vulnerabilities
vendor_ubuntu·2026-03-12·CVSS 3.6
CVE-2025-61984 [LOW] OpenSSH vulnerabilities
Title: OpenSSH vulnerabilities
Summary: Several security issues were fixed in OpenSSH.
USN-8090-1 fixed vulnerabilities in OpenSSH. This update provides the
corresponding updates for Ubuntu 20.04 LTS.
Original advisory details:
Jeremy Brown discovered that the OpenSSH GSSAPI Key Exchange incorrectly
handled disconnecting clients. In non-default configurations where the
GSSAPIKeyExchange setting is enabled, a remote attacker could use this
issue to cause OpenSSH to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2026-3497)
David Leadbeater discovered that OpenSSH incorrectly handled certain
control characters in usernames. When untrusted usernames and the
ProxyCommand are being used, an attacker could possibly use this issue to
execute arbitrary code.
Debian
CVE-2026-3497: openssh - Vulnerability in the OpenSSH GSSAPI delta included in various Linux distribution...
vendor_debian·2026·CVSS 6.9
CVE-2026-3497 [MEDIUM] CVE-2026-3497: openssh - Vulnerability in the OpenSSH GSSAPI delta included in various Linux distribution...
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 terminat
OSV
openssh vulnerabilities
osv·2026-03-12·CVSS 3.6
CVE-2026-3497 [LOW] openssh vulnerabilities
openssh vulnerabilities
Jeremy Brown discovered that the OpenSSH GSSAPI Key Exchange incorrectly
handled disconnecting clients. In non-default configurations where the
GSSAPIKeyExchange setting is enabled, a remote attacker could use this
issue to cause OpenSSH to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2026-3497)
David Leadbeater discovered that OpenSSH incorrectly handled certain
control characters in usernames. When untrusted usernames and the
ProxyCommand are being used, an attacker could possibly use this issue to
execute arbitrary code. (CVE-2025-61984)
David Leadbeater discovered that OpenSSH incorrectly handled NULL
characters in ssh:// URIs. When the ProxyCommand is being used, an attacker
could possibly use this issue to execute arbitr
GHSA
GHSA-wcpp-3x59-h8vp: Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions
ghsa_unreviewed·2026-03-12
CVE-2026-3497 [MEDIUM] CWE-908 GHSA-wcpp-3x59-h8vp: Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions
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 terminat
OSV
CVE-2026-3497: Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions
osv·2026-03-12·CVSS 6.9
CVE-2026-3497 [MEDIUM] CVE-2026-3497: Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions
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 terminat
OSV
openssh vulnerabilities
osv·2026-03-12·CVSS 3.6
CVE-2026-3497 [LOW] openssh vulnerabilities
openssh vulnerabilities
USN-8090-1 fixed vulnerabilities in OpenSSH. This update provides the
corresponding updates for Ubuntu 20.04 LTS.
Original advisory details:
Jeremy Brown discovered that the OpenSSH GSSAPI Key Exchange incorrectly
handled disconnecting clients. In non-default configurations where the
GSSAPIKeyExchange setting is enabled, a remote attacker could use this
issue to cause OpenSSH to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2026-3497)
David Leadbeater discovered that OpenSSH incorrectly handled certain
control characters in usernames. When untrusted usernames and the
ProxyCommand are being used, an attacker could possibly use this issue to
execute arbitrary code. (CVE-2025-61984)
David Leadbeater discovered that OpenSSH incor
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-3497 openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables
bugzilla·2026-03-12·CVSS 6.9
CVE-2026-3497 [MEDIUM] CVE-2026-3497 openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables
CVE-2026-3497 openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables
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 le
Wiz
CVE-2026-3497 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.9
CVE-2026-3497 [MEDIUM] CVE-2026-3497 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-3497 :
OpenSSH vulnerability analysis and mitigation
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 workar
https://ubuntu.com/security/CVE-2026-3497https://www.openwall.com/lists/oss-security/2026/03/12/3http://www.openwall.com/lists/oss-security/2026/03/12/3http://www.openwall.com/lists/oss-security/2026/03/14/3http://www.openwall.com/lists/oss-security/2026/03/14/4http://www.openwall.com/lists/oss-security/2026/03/18/2http://www.openwall.com/lists/oss-security/2026/03/18/4http://www.openwall.com/lists/oss-security/2026/03/18/5http://www.openwall.com/lists/oss-security/2026/03/18/7https://lists.debian.org/debian-lts-announce/2026/04/msg00014.htmlhttps://access.redhat.com/errata/RHSA-2026:10065https://access.redhat.com/errata/RHSA-2026:10714https://access.redhat.com/errata/RHSA-2026:12071https://access.redhat.com/errata/RHSA-2026:13750https://access.redhat.com/errata/RHSA-2026:13812https://access.redhat.com/errata/RHSA-2026:14773https://access.redhat.com/errata/RHSA-2026:14924https://access.redhat.com/errata/RHSA-2026:15087https://access.redhat.com/errata/RHSA-2026:15891https://access.redhat.com/errata/RHSA-2026:15893https://access.redhat.com/errata/RHSA-2026:16008https://access.redhat.com/errata/RHSA-2026:16009https://access.redhat.com/errata/RHSA-2026:16030https://access.redhat.com/errata/RHSA-2026:16174https://access.redhat.com/errata/RHSA-2026:17596https://access.redhat.com/errata/RHSA-2026:19724https://access.redhat.com/errata/RHSA-2026:19725https://access.redhat.com/errata/RHSA-2026:20040https://access.redhat.com/errata/RHSA-2026:20087https://access.redhat.com/errata/RHSA-2026:21690https://access.redhat.com/errata/RHSA-2026:21695https://access.redhat.com/errata/RHSA-2026:25096https://access.redhat.com/errata/RHSA-2026:5475https://access.redhat.com/errata/RHSA-2026:6461https://access.redhat.com/errata/RHSA-2026:6462https://access.redhat.com/errata/RHSA-2026:6463https://access.redhat.com/errata/RHSA-2026:7107https://access.redhat.com/errata/RHSA-2026:9415https://access.redhat.com/errata/RHSA-2026:9732https://access.redhat.com/security/cve/CVE-2026-3497https://bugzilla.redhat.com/show_bug.cgi?id=2447085https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3497.json
2026-03-12
Published