CVE-2026-119194 is a high-severity vulnerability in pyasn1 used by Certsync, where decoding attacker-controlled schemaless BER, CER, or DER data with many distinct long tag IDs causes quadratic CPU usage. This can lead to excessive CPU consumption and reduced service availability. The issue arises from inefficient handling of TagSet insertions during decoding. No confidentiality or integrity impacts were observed.