CVE-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 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.
References
Link Resource
https://ubuntu.com/security/CVE-2026-3497 Third Party Advisory
https://www.openwall.com/lists/oss-security/2026/03/12/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/12/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/14/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/14/4 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/18/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/18/4 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/18/5 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/18/7 Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2026/04/msg00014.html Mailing List Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:10065
https://access.redhat.com/errata/RHSA-2026:10714
https://access.redhat.com/errata/RHSA-2026:12071
https://access.redhat.com/errata/RHSA-2026:13750
https://access.redhat.com/errata/RHSA-2026:13812
https://access.redhat.com/errata/RHSA-2026:14773
https://access.redhat.com/errata/RHSA-2026:14924
https://access.redhat.com/errata/RHSA-2026:15087
https://access.redhat.com/errata/RHSA-2026:15891
https://access.redhat.com/errata/RHSA-2026:15893
https://access.redhat.com/errata/RHSA-2026:16008
https://access.redhat.com/errata/RHSA-2026:16009
https://access.redhat.com/errata/RHSA-2026:16030
https://access.redhat.com/errata/RHSA-2026:16174
https://access.redhat.com/errata/RHSA-2026:17596
https://access.redhat.com/errata/RHSA-2026:19724
https://access.redhat.com/errata/RHSA-2026:19725
https://access.redhat.com/errata/RHSA-2026:20040
https://access.redhat.com/errata/RHSA-2026:20087
https://access.redhat.com/errata/RHSA-2026:21690
https://access.redhat.com/errata/RHSA-2026:21695
https://access.redhat.com/errata/RHSA-2026:25096
https://access.redhat.com/errata/RHSA-2026:5475
https://access.redhat.com/errata/RHSA-2026:6461
https://access.redhat.com/errata/RHSA-2026:6462
https://access.redhat.com/errata/RHSA-2026:6463
https://access.redhat.com/errata/RHSA-2026:7107
https://access.redhat.com/errata/RHSA-2026:9415
https://access.redhat.com/errata/RHSA-2026:9732
https://access.redhat.com/security/cve/CVE-2026-3497
https://bugzilla.redhat.com/show_bug.cgi?id=2447085
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3497.json
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:canonical:ubuntu_linux:25.10:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:-:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:22.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

History

14 Jul 2026, 13:18

Type Values Removed Values Added
References
  • () https://cert-portal.siemens.com/productcert/html/ssa-019113.html -

30 Jun 2026, 03:19

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:10065 -
  • () https://access.redhat.com/errata/RHSA-2026:10714 -
  • () https://access.redhat.com/errata/RHSA-2026:12071 -
  • () https://access.redhat.com/errata/RHSA-2026:13750 -
  • () https://access.redhat.com/errata/RHSA-2026:13812 -
  • () https://access.redhat.com/errata/RHSA-2026:14773 -
  • () https://access.redhat.com/errata/RHSA-2026:14924 -
  • () https://access.redhat.com/errata/RHSA-2026:15087 -
  • () https://access.redhat.com/errata/RHSA-2026:15891 -
  • () https://access.redhat.com/errata/RHSA-2026:15893 -
  • () https://access.redhat.com/errata/RHSA-2026:16008 -
  • () https://access.redhat.com/errata/RHSA-2026:16009 -
  • () https://access.redhat.com/errata/RHSA-2026:16030 -
  • () https://access.redhat.com/errata/RHSA-2026:16174 -
  • () https://access.redhat.com/errata/RHSA-2026:17596 -
  • () https://access.redhat.com/errata/RHSA-2026:19724 -
  • () https://access.redhat.com/errata/RHSA-2026:19725 -
  • () https://access.redhat.com/errata/RHSA-2026:20040 -
  • () https://access.redhat.com/errata/RHSA-2026:20087 -
  • () https://access.redhat.com/errata/RHSA-2026:21690 -
  • () https://access.redhat.com/errata/RHSA-2026:21695 -
  • () https://access.redhat.com/errata/RHSA-2026:25096 -
  • () https://access.redhat.com/errata/RHSA-2026:5475 -
  • () https://access.redhat.com/errata/RHSA-2026:6461 -
  • () https://access.redhat.com/errata/RHSA-2026:6462 -
  • () https://access.redhat.com/errata/RHSA-2026:6463 -
  • () https://access.redhat.com/errata/RHSA-2026:7107 -
  • () https://access.redhat.com/errata/RHSA-2026:9415 -
  • () https://access.redhat.com/errata/RHSA-2026:9732 -
  • () https://access.redhat.com/security/cve/CVE-2026-3497 -
  • () https://bugzilla.redhat.com/show_bug.cgi?id=2447085 -
  • () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3497.json -
CWE CWE-824

02 Jun 2026, 19:43

Type Values Removed Values Added
First Time Openbsd
Openbsd openssh
Debian debian Linux
Redhat
Debian
Canonical ubuntu Linux
Redhat enterprise Linux
Canonical
CVSS v2 : unknown
v3 : unknown
v2 : unknown
v3 : 7.5
CPE cpe:2.3:o:canonical:ubuntu_linux:22.04:*:*:*:lts:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:a:canonical:ubuntu_linux:25.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
References () https://ubuntu.com/security/CVE-2026-3497 - () https://ubuntu.com/security/CVE-2026-3497 - Third Party Advisory
References () https://www.openwall.com/lists/oss-security/2026/03/12/3 - () https://www.openwall.com/lists/oss-security/2026/03/12/3 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/12/3 - () http://www.openwall.com/lists/oss-security/2026/03/12/3 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/14/3 - () http://www.openwall.com/lists/oss-security/2026/03/14/3 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/14/4 - () http://www.openwall.com/lists/oss-security/2026/03/14/4 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/18/2 - () http://www.openwall.com/lists/oss-security/2026/03/18/2 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/18/4 - () http://www.openwall.com/lists/oss-security/2026/03/18/4 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/18/5 - () http://www.openwall.com/lists/oss-security/2026/03/18/5 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/18/7 - () http://www.openwall.com/lists/oss-security/2026/03/18/7 - Mailing List, Third Party Advisory
References () https://lists.debian.org/debian-lts-announce/2026/04/msg00014.html - () https://lists.debian.org/debian-lts-announce/2026/04/msg00014.html - Mailing List, Third Party Advisory

16 Apr 2026, 19:16

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2026/04/msg00014.html -

18 Mar 2026, 19:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/03/18/5 -
  • () http://www.openwall.com/lists/oss-security/2026/03/18/7 -

18 Mar 2026, 16:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/03/18/4 -

18 Mar 2026, 13:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/03/18/2 -

16 Mar 2026, 14:19

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/03/14/3 -
  • () http://www.openwall.com/lists/oss-security/2026/03/14/4 -
Summary
  • (es) Vulnerabilidad en el delta GSSAPI de OpenSSH incluida en varias distribuciones de Linux. Esta vulnerabilidad afecta a los parches GSSAPI añadidos por varias distribuciones de Linux y no afecta al proyecto upstream de OpenSSH en sí. El uso de sshpkt_disconnect() en caso de error, que no termina el proceso, permite a un atacante enviar un tipo de mensaje GSSAPI inesperado durante el intercambio de claves GSSAPI al servidor, lo que llamará a la función subyacente y continuará la ejecución del programa sin establecer las variables de conexión relacionadas. Como las variables no se inicializan a NULL, el código accede posteriormente a esas variables no inicializadas, accediendo a memoria aleatoria, lo que podría llevar a un comportamiento indefinido. La solución alternativa recomendada es usar ssh_packet_disconnect() en su lugar, que sí termina el proceso. El impacto de la vulnerabilidad depende en gran medida de la configuración de endurecimiento de las banderas del compilador.

12 Mar 2026, 20:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/03/12/3 -

12 Mar 2026, 19:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-03-12 19:16

Updated : 2026-07-15 02:21


NVD link : CVE-2026-3497

Mitre link : CVE-2026-3497

CVE.ORG link : CVE-2026-3497


JSON object : View

Products Affected

openbsd

  • openssh

debian

  • debian_linux

canonical

  • ubuntu_linux

redhat

  • enterprise_linux
CWE
CWE-908

Use of Uninitialized Resource

CWE-824

Access of Uninitialized Pointer