LOW CVSS 3.3
Published: 2026-03-26

CVE-2026-0965

libssh libssh Security Advisory (CVE-2026-0965)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2026-0965 impacting libssh libssh. Evaluated with CVSS Base Score of 3.3 (LOW).

Original NVD Description

Source: NIST NVD
A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A local attacker can exploit this by providing a malicious configuration file or when the system is misconfigured. This vulnerability could lead to a Denial of Service (DoS) by causing the system to try and access dangerous files, such as block devices or large system files, which can disrupt normal operations.

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Local (AV:L)
Requires local system execution permissions
Attack Complexity
Low (AC:L)
No specialized conditions required
Privileges Required
Low (PR:L)
Standard user access required
User Interaction
None (UI:N)
Zero human interaction required
Scope
Unchanged (S:U)
Confined to same security context
Confidentiality
None (C:N)
No data confidentiality impact
Integrity
None (I:N)
No system modification impact
Availability
Low (A:L)
Partial service performance degradation

🎯 Affected Versions Matrix

Affected Product libssh / libssh
Affected Versions *
Weakness Enumeration CWE-73

Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe

High-Intent Research Tool

Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-2026-0965 impacting libssh libssh.

⚡ Nuclei Detection Template (YAML) cve-2026-0965.yaml
id: cve-2026-0965

info:
  name: libssh libssh - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: low
  description: |
    Automated signature & scanner for CVE-2026-0965 affecting libssh libssh.
    Evaluation: A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A local attacker can exploit this by providing a...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2026-0965
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
    cvss-score: 3.3
    cve-id: CVE-2026-0965
    cwe-id: CWE-73
  tags: cve,cve-2026-0965,libssh,libssh,low

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "libssh"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2026-0965.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2026-0965
# Target: libssh libssh | CVSS: 3.3 (LOW)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2026-0965 (libssh libssh)...")
    headers = {
        "User-Agent": "CyberVault-Audit-Scanner/2.0",
        "Accept": "*/*"
    }
    try:
        r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
        print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
        if r.status_code < 500:
            print(f"[!] Target reachable. Verify version against libssh libssh scope (*).")
        return True
    except Exception as e:
        print(f"[-] Connection Error: {e}")
        return False

if __name__ == '__main__':
    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
    verify_vulnerability(url)
🛡️ Quick Patch & Remediation Script (Bash) patch_cve-2026-0965.sh
# Recommended Remediation & Patching Commands for CVE-2026-0965
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install libssh 2>/dev/null || \
sudo dnf upgrade libssh 2>/dev/null || \
sudo yum update libssh

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i libssh 2>/dev/null || rpm -qa | grep -i libssh

# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."

🛡️ Remediation & Security Action

  • Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
  • Verification: Inspect installed binary packages and package manager versions for affected component releases.
  • Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
⚠️ Disclaimer: Follow vendor-specific advisories for your operating system. CyberVault does not fabricate unsupported remediation scripts.

🔗 Verified Technical References

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2026-0965 in libssh libssh?

Review vendor-specific security notices and update libssh libssh packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.

Is there an active exploit or public PoC for CVE-2026-0965?

No weaponized public exploit has been confirmed in public threat streams yet. Continuous surveillance is active across GitHub and security feeds.

What is the CVSS 3.1 severity rating and impact for CVE-2026-0965?

CVE-2026-0965 is classified with a CVSS 3.1 Base Score of 3.3 (LOW). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
3.3
LOW SEVERITY
CVE ID CVE-2026-0965
Weakness CWE-73
Vendor libssh
Product libssh
Published 2026-03-26
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L