CVE-2026-3497

Summary

CVE	CVE-2026-3497
State	PUBLISHED
Assigner	canonical
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-03-12 19:16:19 UTC
Updated	2026-04-16 19:16:34 UTC
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.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from [email protected]

CVSS: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

EPSS: 0.000350000 probability, percentile 0.101610000 (date 2026-04-16)

Problem Types: CWE-908 | CWE-908 CWE-908 Use of Uninitialized Resource

Version	Source	Type	Score	Severity	Vector
4.0	[email protected]	Secondary	6.9	MEDIUM	`CVSS: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/C...`
4.0	CNA	CVSS	2.7	LOW	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N`

CVSS v4.0 Breakdown

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

Confidentiality

None

Integrity

Low

Availability

Low

Sub Conf.

None

Sub Integrity

None

Sub Availability

None

CVSS: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

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Ubuntu	Openssh	affected 1:10.0p1-5ubuntu5 1:10.0p1-5ubuntu5.1 dpkg	Not specified
CNA	Ubuntu	Openssh	affected 1:9.6p1-3ubuntu13 1:9.6p1-3ubuntu13.15 dpkg	Not specified
CNA	Ubuntu	Openssh	affected 1:8.9p1-3 1:8.9p1-3ubuntu0.14 dpkg	Not specified

References

Reference	Source	Link	Tags
www.openwall.com/lists/oss-security/2026/03/18/4	af854a3a-2127-422b-91ae-364da2661108	www.openwall.com
lists.debian.org/debian-lts-announce/2026/04/msg00014.html	af854a3a-2127-422b-91ae-364da2661108	lists.debian.org
www.openwall.com/lists/oss-security/2026/03/18/5	af854a3a-2127-422b-91ae-364da2661108	www.openwall.com
www.openwall.com/lists/oss-security/2026/03/18/7	af854a3a-2127-422b-91ae-364da2661108	www.openwall.com
www.openwall.com/lists/oss-security/2026/03/12/3	[email protected]	www.openwall.com
www.openwall.com/lists/oss-security/2026/03/12/3	af854a3a-2127-422b-91ae-364da2661108	www.openwall.com
www.openwall.com/lists/oss-security/2026/03/18/2	af854a3a-2127-422b-91ae-364da2661108	www.openwall.com
www.openwall.com/lists/oss-security/2026/03/14/4	af854a3a-2127-422b-91ae-364da2661108	www.openwall.com
ubuntu.com/security/CVE-2026-3497	[email protected]	ubuntu.com
www.openwall.com/lists/oss-security/2026/03/14/3	af854a3a-2127-422b-91ae-364da2661108	www.openwall.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jeremy Brown (en)

There are currently no legacy QID mappings associated with this CVE.