Skip to main content

Openssh CVE-2026-3497

MEDIUM
Use of Uninitialized Resource (CWE-908)
2026-03-12 security@ubuntu.com
Information Disclosure SSH Microsoft Debian Red Hat Canonical Debian Linux Enterprise Linux Ubuntu Linux Openssh Openbsd
6.9
CVSS 4.0 · Vendor: ubuntu
View

Vulnerability Assessment

Weakness
CWE
CWE-908
Exploit ScenarioDerived

An attacker could exploit this vulnerability to send an unexpected GSSAPI message type during the GSSAPI key exchange to the ser.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 12, 2026

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.

RemediationAI

A vendor patch is available — apply it immediately.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Sign in to check
Technical ContextAI · show details

Classified as CWE-908 (Use of Uninitialized Resource). 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 with

Know when Openssh gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (ubuntu) PRIMARY 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
SUSE 6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Red Hat 8.2 HIGH

Primary rating from Vendor (ubuntu).

CVSS VectorVendor: ubuntu

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
Low
Vulnerable system: Availability
Low
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

3
CVSS changed
Apr 16, 2026 - 19:22 NVD
6.9 (MEDIUM)
Patch released
Mar 18, 2026 - 19:16 nvd
Patch available
CVE Published
Mar 12, 2026 - 19:16 nvd
N/A

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.

Threat Intelligence Overview

EPSS Score
0.1%
Top 81% exploitable
Threat Intel
1
1 source
Data Quality
6 sources
Confidence: High
NVD CVE.org EPSS CISA Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat Yes
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: +10
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

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:*:*:*:*:*:*:*

More in Openssh

View all
CVE-2023-38408 CRITICAL POC
9.8 Jul 20

The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path, leading to remot
CVE-2023-25136 MEDIUM POC
6.5 Feb 03

OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. Rated medium se
CVE-2016-6210 MEDIUM POC
5.9 Feb 13

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static

CVE-2015-5600 HIGH POC
8.1 Aug 03

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processin
CVE-2016-6515 HIGH POC
7.5 Aug 07

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password a
CVE-2024-6387 HIGH POC
8.1 Jul 01

Remote code execution in OpenSSH's sshd server (regression of CVE-2006-5051) allows unauthenticated remote attackers to

CVE-2019-6111 MEDIUM POC
5.9 Jan 31

An issue was discovered in OpenSSH 7.9. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no
CVE-2025-26465 MEDIUM
6.8 Feb 18

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. Rated medium severity (CVSS 6.8), this
CVE-2023-48795 MEDIUM POC
5.9 Dec 18

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remot
CVE-2016-0777 MEDIUM
6.5 Jan 14

The resend_bytes function in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2 allows remote serv
CVE-2016-3115 MEDIUM POC
6.4 Mar 22

Multiple CRLF injection vulnerabilities in session.c in sshd in OpenSSH before 7.2p2 allow remote authenticated users to
CVE-2019-6110 MEDIUM POC
6.8 Jan 31

In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in-T

Same weakness CWE-908 – Use of Uninitialized Resource

View all
CVE-2011-1255 CRITICAL POC
9.3
CVE-2024-50302 MEDIUM
5.5
CVE-2024-12085 HIGH POC
7.5
CVE-2021-1104 CRITICAL POC
9.8
CVE-2021-29937 CRITICAL POC
9.8
CVE-2021-29936 CRITICAL POC
9.8
CVE-2021-26305 CRITICAL POC
9.8
CVE-2019-9641 CRITICAL POC
9.8

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SLES15-SP5-CHOST-BYOS-SAP-CCloud Fixed
SLES15-SP6-CHOST-BYOS Fixed

Threat IntelligenceMISP

CISA Advisories
ICSA-26-209-04
Sources: CISA (public domain)

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2026:6461 ADVISORY https://access.redhat.com/errata/RHSA-2026:6462 ADVISORY https://access.redhat.com/errata/RHSA-2026:6463 ADVISORY https://access.redhat.com/errata/RHSA-2026:7107 ADVISORY https://ubuntu.com/security/notices/USN-8090-1 ADVISORY https://ubuntu.com/security/notices/USN-8090-2 ADVISORY https://vuldb.com/?id.350750 REF http://www.openwall.com/lists/oss-security/2026/03/12/3 REF http://www.openwall.com/lists/oss-security/2026/03/14/3 REF http://www.openwall.com/lists/oss-security/2026/03/14/4 REF http://www.openwall.com/lists/oss-security/2026/03/18/2 REF http://www.openwall.com/lists/oss-security/2026/03/18/4 REF http://www.openwall.com/lists/oss-security/2026/03/18/5 REF http://www.openwall.com/lists/oss-security/2026/03/18/7 REF https://access.redhat.com/errata/RHSA-2026:10065 REF https://access.redhat.com/errata/RHSA-2026:10714 REF https://access.redhat.com/errata/RHSA-2026:12071 REF https://access.redhat.com/errata/RHSA-2026:13750 REF https://access.redhat.com/errata/RHSA-2026:13812 REF https://access.redhat.com/errata/RHSA-2026:14773 REF https://access.redhat.com/errata/RHSA-2026:14924 REF https://access.redhat.com/errata/RHSA-2026:15087 REF https://access.redhat.com/errata/RHSA-2026:15891 REF https://access.redhat.com/errata/RHSA-2026:15893 REF https://access.redhat.com/errata/RHSA-2026:16008 REF https://access.redhat.com/errata/RHSA-2026:16009 REF https://access.redhat.com/errata/RHSA-2026:16030 REF https://access.redhat.com/errata/RHSA-2026:16174 REF https://access.redhat.com/errata/RHSA-2026:17596 REF https://access.redhat.com/errata/RHSA-2026:19724 REF https://access.redhat.com/errata/RHSA-2026:19725 REF https://access.redhat.com/errata/RHSA-2026:20040 REF https://access.redhat.com/errata/RHSA-2026:20087 REF https://access.redhat.com/errata/RHSA-2026:21690 REF https://access.redhat.com/errata/RHSA-2026:21695 REF https://access.redhat.com/errata/RHSA-2026:25096 REF https://access.redhat.com/errata/RHSA-2026:5475 REF https://access.redhat.com/errata/RHSA-2026:9415 REF https://access.redhat.com/errata/RHSA-2026:9732 REF https://access.redhat.com/security/cve/CVE-2026-3497 REF https://bugzilla.redhat.com/show_bug.cgi?id=2447085 REF https://cert-portal.siemens.com/productcert/html/ssa-019113.html REF https://cert-portal.siemens.com/productcert/html/ssa-457936.html REF https://lists.debian.org/debian-lts-announce/2026/04/msg00014.html REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3497.json REF https://ubuntu.com/security/CVE-2026-3497 REF https://www.openwall.com/lists/oss-security/2026/03/12/3

Search Externally

GitHub PoC Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy