✨ Overview

CVE-2026-8451 is a High-Severity memory disclosure vulnerability caused by an Out-of-Bounds Read (CWE-125) during SAML Identity Provider request processing.

An unauthenticated attacker can send specially crafted SAML requests to trigger a memory overread, potentially exposing sensitive process memory.

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📊 Vulnerability Snapshot

Property	Value
CVE	CVE-2026-8451
Severity	🔴 High
CVSS	8.8
CWE	CWE-125
Attack Vector	Network
Authentication	❌ None
User Interaction	❌ None
Affected Service	/saml/login
Impact	Memory Disclosure
Patch Available	✅ Yes

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🎯 Potential Impact

Successful exploitation may expose:

• Authentication artifacts
• Runtime secrets
• Sensitive process memory
• Session-related information
• Internal memory structures

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🧩 Root Cause

Incoming SAML Request
          │
          ▼
 Improper XML Validation
          │
          ▼
 Out-of-Bounds Read
          │
          ▼
 Memory Disclosure

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📦 Affected Products

Product	Status
NetScaler ADC	✅ Affected
NetScaler Gateway	✅ Affected

Only systems configured as a SAML Identity Provider (IdP) are vulnerable.

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✅ Fixed Versions

Release Branch	Fixed Version
14.1	14.1-72.61
13.1	13.1-63.18
FIPS	Latest
NDcPP	Latest

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🛡️ Mitigation

✔ Upgrade Immediately
✔ Disable SAML IdP if Unused
✔ Restrict Internet Exposure
✔ Monitor /saml/login
✔ Review Authentication Logs
✔ Deploy IDS/IPS Signatures
✔ Detect Memory Disclosure Attempts

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🔍 Detection

Monitor for:

• Excessive requests to /saml/login
• Malformed XML payloads
• Unexpected NetScaler crashes
• Authentication anomalies
• Suspicious SAML assertions

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📈 Exploitation Status

Public Research	Proof of Concept	In-the-Wild
✅ Available	🟡 Partial	❌ No Confirmed Reports

[+] CVE-2026-8451 PoC - Ashraf Zaryouh (0xBlackash)
[+] Target: https://target.example.com
[+] Starting memory overread attempts...

[-] Attempt 1/12 (padding 476) - No leak
[-] Attempt 2/12 (padding 508) - No leak
[+] SUCCESS! Memory leak detected (padding: 540)

    Leaked bytes: 312

Hexdump:
  66 6f 6f 62 61 72 00 00  de de de de de de de de   |foobar..........|
  0d 0a 41 75 74 68 65 6e  74 69 63 61 74 69 6f 6e   |..Authentication|
  3a 20 53 65 73 73 69 6f  6e 49 44 3d 78 78 78 78   |: SessionID=xxxx|
  de de de de de de de de  0a 0d 55 73 65 72 2d 41   |..........User-A|
  67 65 6e 74 3a 20 4d 6f  7a 69 6c 6c 61 2f 35 2e   |gent: Mozilla/5.|
  ... (more binary data)

ASCII preview:
foobar......Authentication: SessionID=xxxx......User-Agent: Mozilla/5.

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📚 References

• NIST National Vulnerability Database
• Citrix Security Advisory
• watchTowr Labs Research
• CISA (if added)

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⚖️ Disclaimer

This repository is provided for educational, defensive, and cybersecurity research purposes only. It does not include exploit code or instructions for unauthorized access. Always conduct security testing with proper authorization.

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