CVE-2026-119196 is a vulnerability in pyasn1 versions through 0.6.4 where decoding constructed BIT STRING values with many fragments causes quadratic CPU consumption. This can lead to CPU exhaustion and denial of service when processing attacker-controlled ASN.1 data. The issue affects BER and CER decoders and certain schema-driven DER decoding paths. No confidentiality or integrity impact is reported. The vulnerability has a CVSS score of 7.5, indicating high severity.