Skip to content
Noroxi
NVD / CVE Program· CNA redhat

CVE-2026-0966: Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()

HighCVSS 8.2 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.60% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: azl3 libssh 0.10.6-5 on Azure Linux 3.0 0.10.6-6; azl3 libssh 0.10.6-6 on Azure Linux 3.0 0.10.6-7; azl3 libssh 0.10.6-7 on Azure Linux 3.0 0.10.6-7.

Low priority for now. Upgrade to azl3 libssh 0.10.6-5 on Azure Linux 3.0 0.10.6-6; azl3 libssh 0.10.6-6 on Azure Linux 3.0 0.10.6-7; azl3 libssh 0.10.6-7 on Azure Linux 3.0 0.10.6-7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.

Published
Mar 26, 2026
Updated
Nov 5, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.2
CNA · redhat
6.5
1.7 point gap

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-0966

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for libssh records
Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
libsshlibssh
redhathardened images
redhatopenshift container platform
redhatenterprise linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:0.12.0-2.el10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • 0:0.10.4-18.el9 and laternot affected · rpm
    • 0:0.10.4-18.el9 and laternot affected · rpm

  • Red Hat Red Hat Hardened Images

    • 0.12.0-1.1.hum1 and laternot affected · rpm
    • all versionsunknown

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsaffected
    • all versionsaffected
Affected versions · NVD (6)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • libssh libsshbefore 0.11.4
  • redhat enterprise linux10.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0
  • redhat hardened imagesall versions
  • redhat openshift container platform4.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10libsshbefore 0.12.0-2.el100.12.0-2.el10
AlmaLinux:10libssh-configbefore 0.12.0-2.el100.12.0-2.el10
AlmaLinux:10libssh-develbefore 0.12.0-2.el100.12.0-2.el10
AlmaLinux:9libsshbefore 0.10.4-18.el90.10.4-18.el9
AlmaLinux:9libssh-configbefore 0.10.4-18.el90.10.4-18.el9
AlmaLinux:9libssh-develbefore 0.10.4-18.el90.10.4-18.el9
Alpine:v3.23libsshbefore 0.11.4-r00.11.4-r0
Alpine:v3.24libsshbefore 0.12.0-r00.12.0-r0
Debian:12libsshbefore 0.10.6-0+deb12u30.10.6-0+deb12u3
Debian:13libsshbefore 0.11.5-0+deb13u10.11.5-0+deb13u1
Debian:14libsshbefore 0.12.0-10.12.0-1
openSUSE:Leap 15.6libsshbefore 0.9.8-150600.11.9.10.9.8-150600.11.9.1
openSUSE:Tumbleweedlibsshbefore 0.11.4-1.10.11.4-1.1
Red Hat:enterprise_linux:10.2libsshbefore 0:0.12.0-2.el100:0.12.0-2.el10
Red Hat:enterprise_linux:10.2libssh-configbefore 0:0.12.0-2.el100:0.12.0-2.el10
Red Hat:enterprise_linux:10.2libssh-debuginfobefore 0:0.12.0-2.el100:0.12.0-2.el10
Red Hat:enterprise_linux:10.2libssh-debugsourcebefore 0:0.12.0-2.el100:0.12.0-2.el10
Red Hat:enterprise_linux:10.2libssh-develbefore 0:0.12.0-2.el100:0.12.0-2.el10
Red Hat:enterprise_linux:9::appstreamlibssh-debuginfobefore 0:0.10.4-18.el90:0.10.4-18.el9
Red Hat:enterprise_linux:9::appstreamlibssh-debugsourcebefore 0:0.10.4-18.el90:0.10.4-18.el9
Red Hat:enterprise_linux:9::appstreamlibssh-develbefore 0:0.10.4-18.el90:0.10.4-18.el9
Red Hat:enterprise_linux:9::baseoslibsshbefore 0:0.10.4-18.el90:0.10.4-18.el9
Red Hat:enterprise_linux:9::baseoslibssh-configbefore 0:0.10.4-18.el90:0.10.4-18.el9
Red Hat:hummingbird:1libsshbefore 0:0.12.0-1.1.hum10:0.12.0-1.1.hum1

+11

Same product

libssh: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-10933A vulnerability was found in libssh's server-side state machine before versions 0.7.6 and 0.8.4.
    64This week
  • CVE-2019-14889A flaw was found with the libssh API function ssh_scp_new() in versions before 0.9.3 and before 0.8.8.
    36Monitor
  • CVE-2026-59851Libssh: libssh: authentication bypass via missing gssapi principal check
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-0964Mar 26, 2026 · Libssh: improper sanitation of paths received from scp servers
    25Monitor
  • ← EarlierCVE-2026-0965Mar 26, 2026 · Libssh: libssh: denial of service via improper configuration file handling
    13Monitor
  • Later →CVE-2026-0967Mar 26, 2026 · Libssh: libssh: denial of service via inefficient regular expression processing
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 libssh 0.10.6-5 on Azure Linux 3.00.10.6-6 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 libssh 0.10.6-6 on Azure Linux 3.00.10.6-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 libssh 0.10.6-7 on Azure Linux 3.00.10.6-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libssh 0.10.6-5 on CBL Mariner 2.00.10.6-6 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libssh 0.10.6-5 on CBL-Mariner 2.00.10.6-6 · Release NotesMicrosoft (MSRC)
almalinux:libssh0.12.0-2.el10 · AlmaLinux:10Package registry (OSV)
almalinux:libssh-config0.12.0-2.el10 · AlmaLinux:10Package registry (OSV)
almalinux:libssh-devel0.12.0-2.el10 · AlmaLinux:10Package registry (OSV)
alpine:libssh0.11.4-r0 · Alpine:v3.23Package registry (OSV)
debian:libssh0.10.6-0+deb12u3 · Debian:12Package registry (OSV)
debian:libssh0.11.5-0+deb13u1 · Debian:13Package registry (OSV)
opensuse:libssh0.9.8-150600.11.9.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:libssh0:0.12.0-2.el10 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libssh-config0:0.12.0-2.el10 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libssh-debuginfo0:0.12.0-2.el10 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libssh-debugsource0:0.12.0-2.el10 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libssh-devel0:0.12.0-2.el10 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:libssh0:0.12.0-2.el10 · Rocky Linux:10Package registry (OSV)
suse:libssh0.9.8-150200.13.15.1 · SUSE:Linux Enterprise Micro 5.2Package registry (OSV)
suse:libssh0.9.8-150600.11.9.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-124 · Buffer Underwrite ('Buffer Underflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records